Finding the Fourth Proportional to 5,128.52, 7,081.63 and 4,892.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,128.52 : 7,081.63 = 4,892.20 : x
2. Step 2: Convert to fraction form
   5,128.52/7,081.63 = 4,892.20/x
3. Step 3: Cross multiply
   5,128.52x = 7,081.63 × 4,892.20
4. Step 4: Simplify right side
   5,128.52x = 34,644,720.35
5. Step 5: Solve for x
   x = 34,644,720.35/5,128.52
6. Step 6: Final answer
   x = 6,755.31