Finding the Fourth Proportional to 1,085.31, 1,497.45 and 686.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.31 : 1,497.45 = 686.94 : x
2. Step 2: Convert to fraction form
   1,085.31/1,497.45 = 686.94/x
3. Step 3: Cross multiply
   1,085.31x = 1,497.45 × 686.94
4. Step 4: Simplify right side
   1,085.31x = 1,028,650.82
5. Step 5: Solve for x
   x = 1,028,650.82/1,085.31
6. Step 6: Final answer
   x = 947.80