Finding the Fourth Proportional to 28,287.59, 42,440.62 and 13,494.59

Step by Step Solution

1. Step 1: Write the proportion equation
   28,287.59 : 42,440.62 = 13,494.59 : x
2. Step 2: Convert to fraction form
   28,287.59/42,440.62 = 13,494.59/x
3. Step 3: Cross multiply
   28,287.59x = 42,440.62 × 13,494.59
4. Step 4: Simplify right side
   28,287.59x = 572,718,838.61
5. Step 5: Solve for x
   x = 572,718,838.61/28,287.59
6. Step 6: Final answer
   x = 20,246.29