Finding the Fourth Proportional to 1,167.10, 1,610.92 and 688.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,167.10 : 1,610.92 = 688.98 : x
2. Step 2: Convert to fraction form
   1,167.10/1,610.92 = 688.98/x
3. Step 3: Cross multiply
   1,167.10x = 1,610.92 × 688.98
4. Step 4: Simplify right side
   1,167.10x = 1,109,891.66
5. Step 5: Solve for x
   x = 1,109,891.66/1,167.10
6. Step 6: Final answer
   x = 950.98