Finding the Fourth Proportional to 2,129.55, 3,175.52 and 1,870.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,129.55 : 3,175.52 = 1,870.61 : x
2. Step 2: Convert to fraction form
   2,129.55/3,175.52 = 1,870.61/x
3. Step 3: Cross multiply
   2,129.55x = 3,175.52 × 1,870.61
4. Step 4: Simplify right side
   2,129.55x = 5,940,159.47
5. Step 5: Solve for x
   x = 5,940,159.47/2,129.55
6. Step 6: Final answer
   x = 2,789.40