Finding the Fourth Proportional to 2,223.71, 3,068.74 and 1,439.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,223.71 : 3,068.74 = 1,439.12 : x
2. Step 2: Convert to fraction form
   2,223.71/3,068.74 = 1,439.12/x
3. Step 3: Cross multiply
   2,223.71x = 3,068.74 × 1,439.12
4. Step 4: Simplify right side
   2,223.71x = 4,416,281.51
5. Step 5: Solve for x
   x = 4,416,281.51/2,223.71
6. Step 6: Final answer
   x = 1,986.00