Finding the Fourth Proportional to 1,215.52, 1,677.24 and 691.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215.52 : 1,677.24 = 691.42 : x
2. Step 2: Convert to fraction form
   1,215.52/1,677.24 = 691.42/x
3. Step 3: Cross multiply
   1,215.52x = 1,677.24 × 691.42
4. Step 4: Simplify right side
   1,215.52x = 1,159,677.28
5. Step 5: Solve for x
   x = 1,159,677.28/1,215.52
6. Step 6: Final answer
   x = 954.06