Finding the Fourth Proportional to 2,139.32, 3,209.70 and 1,445.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.32 : 3,209.70 = 1,445.96 : x
2. Step 2: Convert to fraction form
   2,139.32/3,209.70 = 1,445.96/x
3. Step 3: Cross multiply
   2,139.32x = 3,209.70 × 1,445.96
4. Step 4: Simplify right side
   2,139.32x = 4,641,097.81
5. Step 5: Solve for x
   x = 4,641,097.81/2,139.32
6. Step 6: Final answer
   x = 2,169.43