Finding the Fourth Proportional to 1,272.61, 1,908.88 and 622.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,272.61 : 1,908.88 = 622.89 : x
2. Step 2: Convert to fraction form
   1,272.61/1,908.88 = 622.89/x
3. Step 3: Cross multiply
   1,272.61x = 1,908.88 × 622.89
4. Step 4: Simplify right side
   1,272.61x = 1,189,012.72
5. Step 5: Solve for x
   x = 1,189,012.72/1,272.61
6. Step 6: Final answer
   x = 934.31