Finding the Fourth Proportional to 59,513.60, 89,097.60 and 57,785.60

Step by Step Solution

1. Step 1: Write the proportion equation
   59,513.60 : 89,097.60 = 57,785.60 : x
2. Step 2: Convert to fraction form
   59,513.60/89,097.60 = 57,785.60/x
3. Step 3: Cross multiply
   59,513.60x = 89,097.60 × 57,785.60
4. Step 4: Simplify right side
   59,513.60x = 5,148,558,274.56
5. Step 5: Solve for x
   x = 5,148,558,274.56/59,513.60
6. Step 6: Final answer
   x = 86,510.62