Finding the Fourth Proportional to 2,531.25, 3,493.50 and 2,420.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,531.25 : 3,493.50 = 2,420.55 : x
2. Step 2: Convert to fraction form
   2,531.25/3,493.50 = 2,420.55/x
3. Step 3: Cross multiply
   2,531.25x = 3,493.50 × 2,420.55
4. Step 4: Simplify right side
   2,531.25x = 8,456,191.43
5. Step 5: Solve for x
   x = 8,456,191.43/2,531.25
6. Step 6: Final answer
   x = 3,340.72