Finding the Fourth Proportional to 1,488.64, 2,233.20 and 622.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.64 : 2,233.20 = 622.72 : x
2. Step 2: Convert to fraction form
   1,488.64/2,233.20 = 622.72/x
3. Step 3: Cross multiply
   1,488.64x = 2,233.20 × 622.72
4. Step 4: Simplify right side
   1,488.64x = 1,390,658.30
5. Step 5: Solve for x
   x = 1,390,658.30/1,488.64
6. Step 6: Final answer
   x = 934.18