Finding the Fourth Proportional to 139,465.79, 209,081.13 and 60,520.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,465.79 : 209,081.13 = 60,520.56 : x
2. Step 2: Convert to fraction form
   139,465.79/209,081.13 = 60,520.56/x
3. Step 3: Cross multiply
   139,465.79x = 209,081.13 × 60,520.56
4. Step 4: Simplify right side
   139,465.79x = 12,653,707,073.03
5. Step 5: Solve for x
   x = 12,653,707,073.03/139,465.79
6. Step 6: Final answer
   x = 90,729.83