Finding the Fourth Proportional to 2,128.32, 3,189.53 and 1,191.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.32 : 3,189.53 = 1,191.75 : x
2. Step 2: Convert to fraction form
   2,128.32/3,189.53 = 1,191.75/x
3. Step 3: Cross multiply
   2,128.32x = 3,189.53 × 1,191.75
4. Step 4: Simplify right side
   2,128.32x = 3,801,116.42
5. Step 5: Solve for x
   x = 3,801,116.42/2,128.32
6. Step 6: Final answer
   x = 1,785.97