Finding the Fourth Proportional to 1,135.44, 1,567.89 and 1,098.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,135.44 : 1,567.89 = 1,098.72 : x
2. Step 2: Convert to fraction form
   1,135.44/1,567.89 = 1,098.72/x
3. Step 3: Cross multiply
   1,135.44x = 1,567.89 × 1,098.72
4. Step 4: Simplify right side
   1,135.44x = 1,722,672.10
5. Step 5: Solve for x
   x = 1,722,672.10/1,135.44
6. Step 6: Final answer
   x = 1,517.18