Finding the Fourth Proportional to 5,705.24, 7,909.31 and 5,405.28

Step by Step Solution

1. Step 1: Write the proportion equation
   5,705.24 : 7,909.31 = 5,405.28 : x
2. Step 2: Convert to fraction form
   5,705.24/7,909.31 = 5,405.28/x
3. Step 3: Cross multiply
   5,705.24x = 7,909.31 × 5,405.28
4. Step 4: Simplify right side
   5,705.24x = 42,752,035.16
5. Step 5: Solve for x
   x = 42,752,035.16/5,705.24
6. Step 6: Final answer
   x = 7,493.47