Finding the Fourth Proportional to 2,128.40, 3,191.52 and 1,088.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.40 : 3,191.52 = 1,088.24 : x
2. Step 2: Convert to fraction form
   2,128.40/3,191.52 = 1,088.24/x
3. Step 3: Cross multiply
   2,128.40x = 3,191.52 × 1,088.24
4. Step 4: Simplify right side
   2,128.40x = 3,473,139.72
5. Step 5: Solve for x
   x = 3,473,139.72/2,128.40
6. Step 6: Final answer
   x = 1,631.81