Finding the Fourth Proportional to 2,152.01, 3,228.54 and 691.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,152.01 : 3,228.54 = 691.12 : x
2. Step 2: Convert to fraction form
   2,152.01/3,228.54 = 691.12/x
3. Step 3: Cross multiply
   2,152.01x = 3,228.54 × 691.12
4. Step 4: Simplify right side
   2,152.01x = 2,231,308.56
5. Step 5: Solve for x
   x = 2,231,308.56/2,152.01
6. Step 6: Final answer
   x = 1,036.85