Finding the Fourth Proportional to 28,298.24, 42,432.78 and 12,702.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,298.24 : 42,432.78 = 12,702.50 : x
2. Step 2: Convert to fraction form
   28,298.24/42,432.78 = 12,702.50/x
3. Step 3: Cross multiply
   28,298.24x = 42,432.78 × 12,702.50
4. Step 4: Simplify right side
   28,298.24x = 539,002,387.95
5. Step 5: Solve for x
   x = 539,002,387.95/28,298.24
6. Step 6: Final answer
   x = 19,047.21