Finding the Fourth Proportional to 89,517.96, 123,553.62 and 56,791.28

Step by Step Solution

1. Step 1: Write the proportion equation
   89,517.96 : 123,553.62 = 56,791.28 : x
2. Step 2: Convert to fraction form
   89,517.96/123,553.62 = 56,791.28/x
3. Step 3: Cross multiply
   89,517.96x = 123,553.62 × 56,791.28
4. Step 4: Simplify right side
   89,517.96x = 7,016,768,228.43
5. Step 5: Solve for x
   x = 7,016,768,228.43/89,517.96
6. Step 6: Final answer
   x = 78,383.92