Finding the Fourth Proportional to 139,213,010.83, 208,787,120.78 and 51,815,687.71

Step by Step Solution

1. Step 1: Write the proportion equation
   139,213,010.83 : 208,787,120.78 = 51,815,687.71 : x
2. Step 2: Convert to fraction form
   139,213,010.83/208,787,120.78 = 51,815,687.71/x
3. Step 3: Cross multiply
   139,213,010.83x = 208,787,120.78 × 51,815,687.71
4. Step 4: Simplify right side
   139,213,010.83x = 10,818,448,247,229,226
5. Step 5: Solve for x
   x = 10,818,448,247,229,226/139,213,010.83
6. Step 6: Final answer
   x = 77,711,473.83