Finding the Fourth Proportional to 2,620.50, 3,931.29 and 1,081.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.50 : 3,931.29 = 1,081.50 : x
2. Step 2: Convert to fraction form
   2,620.50/3,931.29 = 1,081.50/x
3. Step 3: Cross multiply
   2,620.50x = 3,931.29 × 1,081.50
4. Step 4: Simplify right side
   2,620.50x = 4,251,690.14
5. Step 5: Solve for x
   x = 4,251,690.14/2,620.50
6. Step 6: Final answer
   x = 1,622.47