Finding the Fourth Proportional to 5,627.31, 8,445.18 and 2,120.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,627.31 : 8,445.18 = 2,120.78 : x
2. Step 2: Convert to fraction form
   5,627.31/8,445.18 = 2,120.78/x
3. Step 3: Cross multiply
   5,627.31x = 8,445.18 × 2,120.78
4. Step 4: Simplify right side
   5,627.31x = 17,910,326.61
5. Step 5: Solve for x
   x = 17,910,326.61/5,627.31
6. Step 6: Final answer
   x = 3,182.75