Finding the Fourth Proportional to 2,081.48, 3,122.22 and 621.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.48 : 3,122.22 = 621.72 : x
2. Step 2: Convert to fraction form
   2,081.48/3,122.22 = 621.72/x
3. Step 3: Cross multiply
   2,081.48x = 3,122.22 × 621.72
4. Step 4: Simplify right side
   2,081.48x = 1,941,146.62
5. Step 5: Solve for x
   x = 1,941,146.62/2,081.48
6. Step 6: Final answer
   x = 932.58