Finding the Fourth Proportional to 139,443.20, 209,038.08 and 56,280.32

Step by Step Solution

1. Step 1: Write the proportion equation
   139,443.20 : 209,038.08 = 56,280.32 : x
2. Step 2: Convert to fraction form
   139,443.20/209,038.08 = 56,280.32/x
3. Step 3: Cross multiply
   139,443.20x = 209,038.08 × 56,280.32
4. Step 4: Simplify right side
   139,443.20x = 11,764,730,034.59
5. Step 5: Solve for x
   x = 11,764,730,034.59/139,443.20
6. Step 6: Final answer
   x = 84,369.33