Finding the Fourth Proportional to 28,131.30, 42,202.42 and 8,409.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,131.30 : 42,202.42 = 8,409.42 : x
2. Step 2: Convert to fraction form
   28,131.30/42,202.42 = 8,409.42/x
3. Step 3: Cross multiply
   28,131.30x = 42,202.42 × 8,409.42
4. Step 4: Simplify right side
   28,131.30x = 354,897,853.77
5. Step 5: Solve for x
   x = 354,897,853.77/28,131.30
6. Step 6: Final answer
   x = 12,615.76