Finding the Fourth Proportional to 59,499.60, 89,076.60 and 57,771.60

Step by Step Solution

1. Step 1: Write the proportion equation
   59,499.60 : 89,076.60 = 57,771.60 : x
2. Step 2: Convert to fraction form
   59,499.60/89,076.60 = 57,771.60/x
3. Step 3: Cross multiply
   59,499.60x = 89,076.60 × 57,771.60
4. Step 4: Simplify right side
   59,499.60x = 5,146,097,704.56
5. Step 5: Solve for x
   x = 5,146,097,704.56/59,499.60
6. Step 6: Final answer
   x = 86,489.62