Finding the Fourth Proportional to 5,428.88, 8,131.92 and 3,471.12

Step by Step Solution

1. Step 1: Write the proportion equation
   5,428.88 : 8,131.92 = 3,471.12 : x
2. Step 2: Convert to fraction form
   5,428.88/8,131.92 = 3,471.12/x
3. Step 3: Cross multiply
   5,428.88x = 8,131.92 × 3,471.12
4. Step 4: Simplify right side
   5,428.88x = 28,226,870.15
5. Step 5: Solve for x
   x = 28,226,870.15/5,428.88
6. Step 6: Final answer
   x = 5,199.39