Finding the Fourth Proportional to 1,417.64, 2,123.72 and 687.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,417.64 : 2,123.72 = 687.73 : x
2. Step 2: Convert to fraction form
   1,417.64/2,123.72 = 687.73/x
3. Step 3: Cross multiply
   1,417.64x = 2,123.72 × 687.73
4. Step 4: Simplify right side
   1,417.64x = 1,460,545.96
5. Step 5: Solve for x
   x = 1,460,545.96/1,417.64
6. Step 6: Final answer
   x = 1,030.27