Finding the Fourth Proportional to 2,128.62, 3,186.33 and 1,152.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.62 : 3,186.33 = 1,152.30 : x
2. Step 2: Convert to fraction form
   2,128.62/3,186.33 = 1,152.30/x
3. Step 3: Cross multiply
   2,128.62x = 3,186.33 × 1,152.30
4. Step 4: Simplify right side
   2,128.62x = 3,671,608.06
5. Step 5: Solve for x
   x = 3,671,608.06/2,128.62
6. Step 6: Final answer
   x = 1,724.88