Finding the Fourth Proportional to 28,216.72, 42,331.20 and 8,493.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,216.72 : 42,331.20 = 8,493.76 : x
2. Step 2: Convert to fraction form
   28,216.72/42,331.20 = 8,493.76/x
3. Step 3: Cross multiply
   28,216.72x = 42,331.20 × 8,493.76
4. Step 4: Simplify right side
   28,216.72x = 359,551,053.31
5. Step 5: Solve for x
   x = 359,551,053.31/28,216.72
6. Step 6: Final answer
   x = 12,742.48