Finding the Fourth Proportional to 2,152.57, 3,221.16 and 1,687.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.57 : 3,221.16 = 1,687.15 : x
2. Step 2: Convert to fraction form
   2,152.57/3,221.16 = 1,687.15/x
3. Step 3: Cross multiply
   2,152.57x = 3,221.16 × 1,687.15
4. Step 4: Simplify right side
   2,152.57x = 5,434,573.48
5. Step 5: Solve for x
   x = 5,434,573.48/2,152.57
6. Step 6: Final answer
   x = 2,524.69