Finding the Fourth Proportional to 59,490.56, 89,375.28 and 56,128.16

Step by Step Solution

1. Step 1: Write the proportion equation
   59,490.56 : 89,375.28 = 56,128.16 : x
2. Step 2: Convert to fraction form
   59,490.56/89,375.28 = 56,128.16/x
3. Step 3: Cross multiply
   59,490.56x = 89,375.28 × 56,128.16
4. Step 4: Simplify right side
   59,490.56x = 5,016,470,015.88
5. Step 5: Solve for x
   x = 5,016,470,015.88/59,490.56
6. Step 6: Final answer
   x = 84,323.80