Finding the Fourth Proportional to 139,417.99, 209,009.41 and 60,472.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,417.99 : 209,009.41 = 60,472.78 : x
2. Step 2: Convert to fraction form
   139,417.99/209,009.41 = 60,472.78/x
3. Step 3: Cross multiply
   139,417.99x = 209,009.41 × 60,472.78
4. Step 4: Simplify right side
   139,417.99x = 12,639,380,068.86
5. Step 5: Solve for x
   x = 12,639,380,068.86/139,417.99
6. Step 6: Final answer
   x = 90,658.17