Finding the Fourth Proportional to 2,219.84, 3,061.92 and 1,287.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,219.84 : 3,061.92 = 1,287.68 : x
2. Step 2: Convert to fraction form
   2,219.84/3,061.92 = 1,287.68/x
3. Step 3: Cross multiply
   2,219.84x = 3,061.92 × 1,287.68
4. Step 4: Simplify right side
   2,219.84x = 3,942,773.15
5. Step 5: Solve for x
   x = 3,942,773.15/2,219.84
6. Step 6: Final answer
   x = 1,776.15