Finding the Fourth Proportional to 2,232.90, 3,081.62 and 1,288.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,232.90 : 3,081.62 = 1,288.72 : x
2. Step 2: Convert to fraction form
   2,232.90/3,081.62 = 1,288.72/x
3. Step 3: Cross multiply
   2,232.90x = 3,081.62 × 1,288.72
4. Step 4: Simplify right side
   2,232.90x = 3,971,345.33
5. Step 5: Solve for x
   x = 3,971,345.33/2,232.90
6. Step 6: Final answer
   x = 1,778.56