Finding the Fourth Proportional to 1,111.88, 1,534.27 and 691.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.88 : 1,534.27 = 691.63 : x
2. Step 2: Convert to fraction form
   1,111.88/1,534.27 = 691.63/x
3. Step 3: Cross multiply
   1,111.88x = 1,534.27 × 691.63
4. Step 4: Simplify right side
   1,111.88x = 1,061,147.16
5. Step 5: Solve for x
   x = 1,061,147.16/1,111.88
6. Step 6: Final answer
   x = 954.37