Finding the Fourth Proportional to 5,471.90, 8,155.88 and 5,160.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,471.90 : 8,155.88 = 5,160.55 : x
2. Step 2: Convert to fraction form
   5,471.90/8,155.88 = 5,160.55/x
3. Step 3: Cross multiply
   5,471.90x = 8,155.88 × 5,160.55
4. Step 4: Simplify right side
   5,471.90x = 42,088,780.34
5. Step 5: Solve for x
   x = 42,088,780.34/5,471.90
6. Step 6: Final answer
   x = 7,691.80