Finding the Fourth Proportional to 28,471.01, 42,702.71 and 8,480.12

Step by Step Solution

1. Step 1: Write the proportion equation
   28,471.01 : 42,702.71 = 8,480.12 : x
2. Step 2: Convert to fraction form
   28,471.01/42,702.71 = 8,480.12/x
3. Step 3: Cross multiply
   28,471.01x = 42,702.71 × 8,480.12
4. Step 4: Simplify right side
   28,471.01x = 362,123,849.21
5. Step 5: Solve for x
   x = 362,123,849.21/28,471.01
6. Step 6: Final answer
   x = 12,719.04