Finding the Fourth Proportional to 2,220.32, 3,064.34 and 1,288.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,220.32 : 3,064.34 = 1,288.82 : x
2. Step 2: Convert to fraction form
   2,220.32/3,064.34 = 1,288.82/x
3. Step 3: Cross multiply
   2,220.32x = 3,064.34 × 1,288.82
4. Step 4: Simplify right side
   2,220.32x = 3,949,360.91
5. Step 5: Solve for x
   x = 3,949,360.91/2,220.32
6. Step 6: Final answer
   x = 1,778.74