Finding the Fourth Proportional to 88,570.40, 121,978.32 and 86,635.04

Step by Step Solution

1. Step 1: Write the proportion equation
   88,570.40 : 121,978.32 = 86,635.04 : x
2. Step 2: Convert to fraction form
   88,570.40/121,978.32 = 86,635.04/x
3. Step 3: Cross multiply
   88,570.40x = 121,978.32 × 86,635.04
4. Step 4: Simplify right side
   88,570.40x = 10,567,596,632.33
5. Step 5: Solve for x
   x = 10,567,596,632.33/88,570.40
6. Step 6: Final answer
   x = 119,312.96