Finding the Fourth Proportional to 5,402.78, 7,455.29 and 3,987.24

Step by Step Solution

1. Step 1: Write the proportion equation
   5,402.78 : 7,455.29 = 3,987.24 : x
2. Step 2: Convert to fraction form
   5,402.78/7,455.29 = 3,987.24/x
3. Step 3: Cross multiply
   5,402.78x = 7,455.29 × 3,987.24
4. Step 4: Simplify right side
   5,402.78x = 29,726,030.50
5. Step 5: Solve for x
   x = 29,726,030.50/5,402.78
6. Step 6: Final answer
   x = 5,501.99