Finding the Fourth Proportional to 64,141.39, 88,539.78 and 57,415.15

Step by Step Solution

1. Step 1: Write the proportion equation
   64,141.39 : 88,539.78 = 57,415.15 : x
2. Step 2: Convert to fraction form
   64,141.39/88,539.78 = 57,415.15/x
3. Step 3: Cross multiply
   64,141.39x = 88,539.78 × 57,415.15
4. Step 4: Simplify right side
   64,141.39x = 5,083,524,749.67
5. Step 5: Solve for x
   x = 5,083,524,749.67/64,141.39
6. Step 6: Final answer
   x = 79,254.98