Finding the Fourth Proportional to 28,182.72, 42,274.88 and 8,461.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,182.72 : 42,274.88 = 8,461.76 : x
2. Step 2: Convert to fraction form
   28,182.72/42,274.88 = 8,461.76/x
3. Step 3: Cross multiply
   28,182.72x = 42,274.88 × 8,461.76
4. Step 4: Simplify right side
   28,182.72x = 357,719,888.59
5. Step 5: Solve for x
   x = 357,719,888.59/28,182.72
6. Step 6: Final answer
   x = 12,692.88