Finding the Fourth Proportional to 2,620.66, 3,931.92 and 1,235.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.66 : 3,931.92 = 1,235.05 : x
2. Step 2: Convert to fraction form
   2,620.66/3,931.92 = 1,235.05/x
3. Step 3: Cross multiply
   2,620.66x = 3,931.92 × 1,235.05
4. Step 4: Simplify right side
   2,620.66x = 4,856,117.80
5. Step 5: Solve for x
   x = 4,856,117.80/2,620.66
6. Step 6: Final answer
   x = 1,853.01