Finding the Fourth Proportional to 89,149.18, 123,039.42 and 56,897.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89,149.18 : 123,039.42 = 56,897.72 : x
2. Step 2: Convert to fraction form
   89,149.18/123,039.42 = 56,897.72/x
3. Step 3: Cross multiply
   89,149.18x = 123,039.42 × 56,897.72
4. Step 4: Simplify right side
   89,149.18x = 7,000,662,468.12
5. Step 5: Solve for x
   x = 7,000,662,468.12/89,149.18
6. Step 6: Final answer
   x = 78,527.50