Finding the Fourth Proportional to 28,499.42, 42,763.17 and 13,720.70

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.42 : 42,763.17 = 13,720.70 : x
2. Step 2: Convert to fraction form
   28,499.42/42,763.17 = 13,720.70/x
3. Step 3: Cross multiply
   28,499.42x = 42,763.17 × 13,720.70
4. Step 4: Simplify right side
   28,499.42x = 586,740,626.62
5. Step 5: Solve for x
   x = 586,740,626.62/28,499.42
6. Step 6: Final answer
   x = 20,587.81