Finding the Fourth Proportional to 5,688.75, 7,851.30 and 5,439.69

Step by Step Solution

1. Step 1: Write the proportion equation
   5,688.75 : 7,851.30 = 5,439.69 : x
2. Step 2: Convert to fraction form
   5,688.75/7,851.30 = 5,439.69/x
3. Step 3: Cross multiply
   5,688.75x = 7,851.30 × 5,439.69
4. Step 4: Simplify right side
   5,688.75x = 42,708,638.10
5. Step 5: Solve for x
   x = 42,708,638.10/5,688.75
6. Step 6: Final answer
   x = 7,507.56