Finding the Fourth Proportional to 28,590.50, 42,900.38 and 13,614.56

Step by Step Solution

1. Step 1: Write the proportion equation
   28,590.50 : 42,900.38 = 13,614.56 : x
2. Step 2: Convert to fraction form
   28,590.50/42,900.38 = 13,614.56/x
3. Step 3: Cross multiply
   28,590.50x = 42,900.38 × 13,614.56
4. Step 4: Simplify right side
   28,590.50x = 584,069,514.96
5. Step 5: Solve for x
   x = 584,069,514.96/28,590.50
6. Step 6: Final answer
   x = 20,428.80