Finding the Fourth Proportional to 64,585.57, 89,171.55 and 57,758.41

Step by Step Solution

1. Step 1: Write the proportion equation
   64,585.57 : 89,171.55 = 57,758.41 : x
2. Step 2: Convert to fraction form
   64,585.57/89,171.55 = 57,758.41/x
3. Step 3: Cross multiply
   64,585.57x = 89,171.55 × 57,758.41
4. Step 4: Simplify right side
   64,585.57x = 5,150,406,945.24
5. Step 5: Solve for x
   x = 5,150,406,945.24/64,585.57
6. Step 6: Final answer
   x = 79,745.47