Finding the Fourth Proportional to 28,498.42, 42,761.67 and 13,719.70

Step by Step Solution

1. Step 1: Write the proportion equation
   28,498.42 : 42,761.67 = 13,719.70 : x
2. Step 2: Convert to fraction form
   28,498.42/42,761.67 = 13,719.70/x
3. Step 3: Cross multiply
   28,498.42x = 42,761.67 × 13,719.70
4. Step 4: Simplify right side
   28,498.42x = 586,677,283.90
5. Step 5: Solve for x
   x = 586,677,283.90/28,498.42
6. Step 6: Final answer
   x = 20,586.31