Finding the Fourth Proportional to 386,688,297,843.78, 533,605,807,039.83 and 213,063,721,087.61

Step by Step Solution

1. Step 1: Write the proportion equation
   386,688,297,843.78 : 533,605,807,039.83 = 213,063,721,087.61 : x
2. Step 2: Convert to fraction form
   386,688,297,843.78/533,605,807,039.83 = 213,063,721,087.61/x
3. Step 3: Cross multiply
   386,688,297,843.78x = 533,605,807,039.83 × 213,063,721,087.61
4. Step 4: Simplify right side
   386,688,297,843.78x = 113,692,038,841,863,378,042,880
5. Step 5: Solve for x
   x = 113,692,038,841,863,378,042,880/386,688,297,843.78
6. Step 6: Final answer
   x = 294,014,686,960.59