Finding the Fourth Proportional to 64,587.90, 89,174.81 and 57,760.74

Step by Step Solution

1. Step 1: Write the proportion equation
   64,587.90 : 89,174.81 = 57,760.74 : x
2. Step 2: Convert to fraction form
   64,587.90/89,174.81 = 57,760.74/x
3. Step 3: Cross multiply
   64,587.90x = 89,174.81 × 57,760.74
4. Step 4: Simplify right side
   64,587.90x = 5,150,802,726.16
5. Step 5: Solve for x
   x = 5,150,802,726.16/64,587.90
6. Step 6: Final answer
   x = 79,748.73