Finding the Fourth Proportional to 139,096.71, 208,686.65 and 98,648.15

Step by Step Solution

1. Step 1: Write the proportion equation
   139,096.71 : 208,686.65 = 98,648.15 : x
2. Step 2: Convert to fraction form
   139,096.71/208,686.65 = 98,648.15/x
3. Step 3: Cross multiply
   139,096.71x = 208,686.65 × 98,648.15
4. Step 4: Simplify right side
   139,096.71x = 20,586,550,415.52
5. Step 5: Solve for x
   x = 20,586,550,415.52/139,096.71
6. Step 6: Final answer
   x = 148,001.71