Finding the Fourth Proportional to 139,525.06, 209,282.91 and 60,639.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,525.06 : 209,282.91 = 60,639.28 : x
2. Step 2: Convert to fraction form
   139,525.06/209,282.91 = 60,639.28/x
3. Step 3: Cross multiply
   139,525.06x = 209,282.91 × 60,639.28
4. Step 4: Simplify right side
   139,525.06x = 12,690,764,978.70
5. Step 5: Solve for x
   x = 12,690,764,978.70/139,525.06
6. Step 6: Final answer
   x = 90,956.89