Finding the Fourth Proportional to 139,464.79, 209,079.63 and 60,519.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,464.79 : 209,079.63 = 60,519.56 : x
2. Step 2: Convert to fraction form
   139,464.79/209,079.63 = 60,519.56/x
3. Step 3: Cross multiply
   139,464.79x = 209,079.63 × 60,519.56
4. Step 4: Simplify right side
   139,464.79x = 12,653,406,167.16
5. Step 5: Solve for x
   x = 12,653,406,167.16/139,464.79
6. Step 6: Final answer
   x = 90,728.32