Finding the Fourth Proportional to 5,619.90, 8,420.55 and 5,040.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,619.90 : 8,420.55 = 5,040.42 : x
2. Step 2: Convert to fraction form
   5,619.90/8,420.55 = 5,040.42/x
3. Step 3: Cross multiply
   5,619.90x = 8,420.55 × 5,040.42
4. Step 4: Simplify right side
   5,619.90x = 42,443,108.63
5. Step 5: Solve for x
   x = 42,443,108.63/5,619.90
6. Step 6: Final answer
   x = 7,552.29