Finding the Fourth Proportional to 2,129.80, 3,175.89 and 1,870.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.80 : 3,175.89 = 1,870.86 : x
2. Step 2: Convert to fraction form
   2,129.80/3,175.89 = 1,870.86/x
3. Step 3: Cross multiply
   2,129.80x = 3,175.89 × 1,870.86
4. Step 4: Simplify right side
   2,129.80x = 5,941,645.57
5. Step 5: Solve for x
   x = 5,941,645.57/2,129.80
6. Step 6: Final answer
   x = 2,789.77