Finding the Fourth Proportional to 1,111.23, 1,532.88 and 691.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.23 : 1,532.88 = 691.43 : x
2. Step 2: Convert to fraction form
   1,111.23/1,532.88 = 691.43/x
3. Step 3: Cross multiply
   1,111.23x = 1,532.88 × 691.43
4. Step 4: Simplify right side
   1,111.23x = 1,059,871.55
5. Step 5: Solve for x
   x = 1,059,871.55/1,111.23
6. Step 6: Final answer
   x = 953.78