Finding the Fourth Proportional to 1,174.72, 1,621.06 and 677.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,174.72 : 1,621.06 = 677.40 : x
2. Step 2: Convert to fraction form
   1,174.72/1,621.06 = 677.40/x
3. Step 3: Cross multiply
   1,174.72x = 1,621.06 × 677.40
4. Step 4: Simplify right side
   1,174.72x = 1,098,106.04
5. Step 5: Solve for x
   x = 1,098,106.04/1,174.72
6. Step 6: Final answer
   x = 934.78