Finding the Fourth Proportional to 1,118.72, 1,543.52 and 698.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.72 : 1,543.52 = 698.88 : x
2. Step 2: Convert to fraction form
   1,118.72/1,543.52 = 698.88/x
3. Step 3: Cross multiply
   1,118.72x = 1,543.52 × 698.88
4. Step 4: Simplify right side
   1,118.72x = 1,078,735.26
5. Step 5: Solve for x
   x = 1,078,735.26/1,118.72
6. Step 6: Final answer
   x = 964.26