Finding the Fourth Proportional to 2,215.05, 3,319.98 and 1,423.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.05 : 3,319.98 = 1,423.40 : x
2. Step 2: Convert to fraction form
   2,215.05/3,319.98 = 1,423.40/x
3. Step 3: Cross multiply
   2,215.05x = 3,319.98 × 1,423.40
4. Step 4: Simplify right side
   2,215.05x = 4,725,642.93
5. Step 5: Solve for x
   x = 4,725,642.93/2,215.05
6. Step 6: Final answer
   x = 2,133.42