Finding the Fourth Proportional to 1,118.10, 1,543.17 and 698.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.10 : 1,543.17 = 698.72 : x
2. Step 2: Convert to fraction form
   1,118.10/1,543.17 = 698.72/x
3. Step 3: Cross multiply
   1,118.10x = 1,543.17 × 698.72
4. Step 4: Simplify right side
   1,118.10x = 1,078,239.06
5. Step 5: Solve for x
   x = 1,078,239.06/1,118.10
6. Step 6: Final answer
   x = 964.35