Finding the Fourth Proportional to 139,416.49, 209,007.17 and 60,471.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,416.49 : 209,007.17 = 60,471.28 : x
2. Step 2: Convert to fraction form
   139,416.49/209,007.17 = 60,471.28/x
3. Step 3: Cross multiply
   139,416.49x = 209,007.17 × 60,471.28
4. Step 4: Simplify right side
   139,416.49x = 12,638,929,751.69
5. Step 5: Solve for x
   x = 12,638,929,751.69/139,416.49
6. Step 6: Final answer
   x = 90,655.92