Finding the Fourth Proportional to 5,572.32, 7,686.72 and 3,978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   5,572.32 : 7,686.72 = 3,978.96 : x
2. Step 2: Convert to fraction form
   5,572.32/7,686.72 = 3,978.96/x
3. Step 3: Cross multiply
   5,572.32x = 7,686.72 × 3,978.96
4. Step 4: Simplify right side
   5,572.32x = 30,585,151.41
5. Step 5: Solve for x
   x = 30,585,151.41/5,572.32
6. Step 6: Final answer
   x = 5,488.76