Finding the Fourth Proportional to 5,320.88, 7,980.56 and 1,425.52

Step by Step Solution

1. Step 1: Write the proportion equation
   5,320.88 : 7,980.56 = 1,425.52 : x
2. Step 2: Convert to fraction form
   5,320.88/7,980.56 = 1,425.52/x
3. Step 3: Cross multiply
   5,320.88x = 7,980.56 × 1,425.52
4. Step 4: Simplify right side
   5,320.88x = 11,376,447.89
5. Step 5: Solve for x
   x = 11,376,447.89/5,320.88
6. Step 6: Final answer
   x = 2,138.08