Finding the Fourth Proportional to 80,978.88, 121,470.48 and 28,391.52

Step by Step Solution

1. Step 1: Write the proportion equation
   80,978.88 : 121,470.48 = 28,391.52 : x
2. Step 2: Convert to fraction form
   80,978.88/121,470.48 = 28,391.52/x
3. Step 3: Cross multiply
   80,978.88x = 121,470.48 × 28,391.52
4. Step 4: Simplify right side
   80,978.88x = 3,448,731,562.33
5. Step 5: Solve for x
   x = 3,448,731,562.33/80,978.88
6. Step 6: Final answer
   x = 42,588.04