Finding the Fourth Proportional to 2,429.80, 3,645.24 and 1,390.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,429.80 : 3,645.24 = 1,390.32 : x
2. Step 2: Convert to fraction form
   2,429.80/3,645.24 = 1,390.32/x
3. Step 3: Cross multiply
   2,429.80x = 3,645.24 × 1,390.32
4. Step 4: Simplify right side
   2,429.80x = 5,068,050.08
5. Step 5: Solve for x
   x = 5,068,050.08/2,429.80
6. Step 6: Final answer
   x = 2,085.79