Finding the Fourth Proportional to 2,429.71, 3,648.21 and 1,390.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,429.71 : 3,648.21 = 1,390.88 : x
2. Step 2: Convert to fraction form
   2,429.71/3,648.21 = 1,390.88/x
3. Step 3: Cross multiply
   2,429.71x = 3,648.21 × 1,390.88
4. Step 4: Simplify right side
   2,429.71x = 5,074,226.23
5. Step 5: Solve for x
   x = 5,074,226.23/2,429.71
6. Step 6: Final answer
   x = 2,088.41