Finding the Fourth Proportional to 28,259.52, 42,387.31 and 8,538.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,259.52 : 42,387.31 = 8,538.18 : x
2. Step 2: Convert to fraction form
   28,259.52/42,387.31 = 8,538.18/x
3. Step 3: Cross multiply
   28,259.52x = 42,387.31 × 8,538.18
4. Step 4: Simplify right side
   28,259.52x = 361,910,482.50
5. Step 5: Solve for x
   x = 361,910,482.50/28,259.52
6. Step 6: Final answer
   x = 12,806.67