Finding the Fourth Proportional to 139,134.71, 208,517.53 and 72,630.77

Step by Step Solution

1. Step 1: Write the proportion equation
   139,134.71 : 208,517.53 = 72,630.77 : x
2. Step 2: Convert to fraction form
   139,134.71/208,517.53 = 72,630.77/x
3. Step 3: Cross multiply
   139,134.71x = 208,517.53 × 72,630.77
4. Step 4: Simplify right side
   139,134.71x = 15,144,788,762.40
5. Step 5: Solve for x
   x = 15,144,788,762.40/139,134.71
6. Step 6: Final answer
   x = 108,849.83