Finding the Fourth Proportional to 28,218.42, 42,311.43 and 8,491.14

Step by Step Solution

1. Step 1: Write the proportion equation
   28,218.42 : 42,311.43 = 8,491.14 : x
2. Step 2: Convert to fraction form
   28,218.42/42,311.43 = 8,491.14/x
3. Step 3: Cross multiply
   28,218.42x = 42,311.43 × 8,491.14
4. Step 4: Simplify right side
   28,218.42x = 359,272,275.73
5. Step 5: Solve for x
   x = 359,272,275.73/28,218.42
6. Step 6: Final answer
   x = 12,731.84