Finding the Fourth Proportional to 2,220.34, 3,064.38 and 1,288.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,220.34 : 3,064.38 = 1,288.84 : x
2. Step 2: Convert to fraction form
   2,220.34/3,064.38 = 1,288.84/x
3. Step 3: Cross multiply
   2,220.34x = 3,064.38 × 1,288.84
4. Step 4: Simplify right side
   2,220.34x = 3,949,495.52
5. Step 5: Solve for x
   x = 3,949,495.52/2,220.34
6. Step 6: Final answer
   x = 1,778.78