Finding the Fourth Proportional to 139,615.20, 207,843.71 and 138,784.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139,615.20 : 207,843.71 = 138,784.83 : x
2. Step 2: Convert to fraction form
   139,615.20/207,843.71 = 138,784.83/x
3. Step 3: Cross multiply
   139,615.20x = 207,843.71 × 138,784.83
4. Step 4: Simplify right side
   139,615.20x = 28,845,553,265.00
5. Step 5: Solve for x
   x = 28,845,553,265.00/139,615.20
6. Step 6: Final answer
   x = 206,607.54