Finding the Fourth Proportional to 1,184.72, 1,635.02 and 687.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,184.72 : 1,635.02 = 687.40 : x
2. Step 2: Convert to fraction form
   1,184.72/1,635.02 = 687.40/x
3. Step 3: Cross multiply
   1,184.72x = 1,635.02 × 687.40
4. Step 4: Simplify right side
   1,184.72x = 1,123,912.75
5. Step 5: Solve for x
   x = 1,123,912.75/1,184.72
6. Step 6: Final answer
   x = 948.67