Finding the Fourth Proportional to 28,279.28, 42,354.33 and 13,498.61

Step by Step Solution

1. Step 1: Write the proportion equation
   28,279.28 : 42,354.33 = 13,498.61 : x
2. Step 2: Convert to fraction form
   28,279.28/42,354.33 = 13,498.61/x
3. Step 3: Cross multiply
   28,279.28x = 42,354.33 × 13,498.61
4. Step 4: Simplify right side
   28,279.28x = 571,724,303.22
5. Step 5: Solve for x
   x = 571,724,303.22/28,279.28
6. Step 6: Final answer
   x = 20,217.07