Finding the Fourth Proportional to 115,777.32, 159,779.43 and 64,789.61

Step by Step Solution

1. Step 1: Write the proportion equation
   115,777.32 : 159,779.43 = 64,789.61 : x
2. Step 2: Convert to fraction form
   115,777.32/159,779.43 = 64,789.61/x
3. Step 3: Cross multiply
   115,777.32x = 159,779.43 × 64,789.61
4. Step 4: Simplify right side
   115,777.32x = 10,352,046,955.72
5. Step 5: Solve for x
   x = 10,352,046,955.72/115,777.32
6. Step 6: Final answer
   x = 89,413.43