Finding the Fourth Proportional to 2,129.59, 2,938.98 and 1,290.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.59 : 2,938.98 = 1,290.33 : x
2. Step 2: Convert to fraction form
   2,129.59/2,938.98 = 1,290.33/x
3. Step 3: Cross multiply
   2,129.59x = 2,938.98 × 1,290.33
4. Step 4: Simplify right side
   2,129.59x = 3,792,258.90
5. Step 5: Solve for x
   x = 3,792,258.90/2,129.59
6. Step 6: Final answer
   x = 1,780.74