Finding the Fourth Proportional to 1,118.64, 1,687.98 and 1,073.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.64 : 1,687.98 = 1,073.69 : x
2. Step 2: Convert to fraction form
   1,118.64/1,687.98 = 1,073.69/x
3. Step 3: Cross multiply
   1,118.64x = 1,687.98 × 1,073.69
4. Step 4: Simplify right side
   1,118.64x = 1,812,367.25
5. Step 5: Solve for x
   x = 1,812,367.25/1,118.64
6. Step 6: Final answer
   x = 1,620.15