Finding the Fourth Proportional to 2,129.55, 2,938.83 and 1,290.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.55 : 2,938.83 = 1,290.09 : x
2. Step 2: Convert to fraction form
   2,129.55/2,938.83 = 1,290.09/x
3. Step 3: Cross multiply
   2,129.55x = 2,938.83 × 1,290.09
4. Step 4: Simplify right side
   2,129.55x = 3,791,355.19
5. Step 5: Solve for x
   x = 3,791,355.19/2,129.55
6. Step 6: Final answer
   x = 1,780.36