Finding the Fourth Proportional to 5,471.91, 8,155.88 and 5,160.56

Step by Step Solution

1. Step 1: Write the proportion equation
   5,471.91 : 8,155.88 = 5,160.56 : x
2. Step 2: Convert to fraction form
   5,471.91/8,155.88 = 5,160.56/x
3. Step 3: Cross multiply
   5,471.91x = 8,155.88 × 5,160.56
4. Step 4: Simplify right side
   5,471.91x = 42,088,841.51
5. Step 5: Solve for x
   x = 42,088,841.51/5,471.91
6. Step 6: Final answer
   x = 7,691.80