Finding the Fourth Proportional to 2,128.91, 2,937.80 and 1,232.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.91 : 2,937.80 = 1,232.61 : x
2. Step 2: Convert to fraction form
   2,128.91/2,937.80 = 1,232.61/x
3. Step 3: Cross multiply
   2,128.91x = 2,937.80 × 1,232.61
4. Step 4: Simplify right side
   2,128.91x = 3,621,144.48
5. Step 5: Solve for x
   x = 3,621,144.48/2,128.91
6. Step 6: Final answer
   x = 1,700.94