Finding the Fourth Proportional to 90,647.52, 135,990.48 and 28,322.72

Step by Step Solution

1. Step 1: Write the proportion equation
   90,647.52 : 135,990.48 = 28,322.72 : x
2. Step 2: Convert to fraction form
   90,647.52/135,990.48 = 28,322.72/x
3. Step 3: Cross multiply
   90,647.52x = 135,990.48 × 28,322.72
4. Step 4: Simplify right side
   90,647.52x = 3,851,620,287.71
5. Step 5: Solve for x
   x = 3,851,620,287.71/90,647.52
6. Step 6: Final answer
   x = 42,490.08