Finding the Fourth Proportional to 139,147.92, 208,753.72 and 60,275.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,147.92 : 208,753.72 = 60,275.28 : x
2. Step 2: Convert to fraction form
   139,147.92/208,753.72 = 60,275.28/x
3. Step 3: Cross multiply
   139,147.92x = 208,753.72 × 60,275.28
4. Step 4: Simplify right side
   139,147.92x = 12,582,688,924.04
5. Step 5: Solve for x
   x = 12,582,688,924.04/139,147.92
6. Step 6: Final answer
   x = 90,426.71