Finding the Fourth Proportional to 1,708.89, 2,561.82 and 830.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,708.89 : 2,561.82 = 830.91 : x
2. Step 2: Convert to fraction form
   1,708.89/2,561.82 = 830.91/x
3. Step 3: Cross multiply
   1,708.89x = 2,561.82 × 830.91
4. Step 4: Simplify right side
   1,708.89x = 2,128,641.86
5. Step 5: Solve for x
   x = 2,128,641.86/1,708.89
6. Step 6: Final answer
   x = 1,245.63