Finding the Fourth Proportional to 28,412.74, 42,609.89 and 13,417.54

Step by Step Solution

1. Step 1: Write the proportion equation
   28,412.74 : 42,609.89 = 13,417.54 : x
2. Step 2: Convert to fraction form
   28,412.74/42,609.89 = 13,417.54/x
3. Step 3: Cross multiply
   28,412.74x = 42,609.89 × 13,417.54
4. Step 4: Simplify right side
   28,412.74x = 571,719,729.86
5. Step 5: Solve for x
   x = 571,719,729.86/28,412.74
6. Step 6: Final answer
   x = 20,121.95