Finding the Fourth Proportional to 2,170.86, 3,255.94 and 610.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,170.86 : 3,255.94 = 610.72 : x
2. Step 2: Convert to fraction form
   2,170.86/3,255.94 = 610.72/x
3. Step 3: Cross multiply
   2,170.86x = 3,255.94 × 610.72
4. Step 4: Simplify right side
   2,170.86x = 1,988,467.68
5. Step 5: Solve for x
   x = 1,988,467.68/2,170.86
6. Step 6: Final answer
   x = 915.98