Finding the Fourth Proportional to 2,521.89, 3,785.13 and 1,290.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.89 : 3,785.13 = 1,290.15 : x
2. Step 2: Convert to fraction form
   2,521.89/3,785.13 = 1,290.15/x
3. Step 3: Cross multiply
   2,521.89x = 3,785.13 × 1,290.15
4. Step 4: Simplify right side
   2,521.89x = 4,883,385.47
5. Step 5: Solve for x
   x = 4,883,385.47/2,521.89
6. Step 6: Final answer
   x = 1,936.40