Finding the Fourth Proportional to 139,098.71, 208,689.65 and 98,650.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,098.71 : 208,689.65 = 98,650.15 : x
2. Step 2: Convert to fraction form
   139,098.71/208,689.65 = 98,650.15/x
3. Step 3: Cross multiply
   139,098.71x = 208,689.65 × 98,650.15
4. Step 4: Simplify right side
   139,098.71x = 20,587,265,275.95
5. Step 5: Solve for x
   x = 20,587,265,275.95/139,098.71
6. Step 6: Final answer
   x = 148,004.72