Finding the Fourth Proportional to 123,639.60, 185,376.72 and 56,989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   123,639.60 : 185,376.72 = 56,989.56 : x
2. Step 2: Convert to fraction form
   123,639.60/185,376.72 = 56,989.56/x
3. Step 3: Cross multiply
   123,639.60x = 185,376.72 × 56,989.56
4. Step 4: Simplify right side
   123,639.60x = 10,564,537,707.04
5. Step 5: Solve for x
   x = 10,564,537,707.04/123,639.60
6. Step 6: Final answer
   x = 85,446.23