Finding the Fourth Proportional to 1,443.89, 2,161.36 and 784.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.89 : 2,161.36 = 784.13 : x
2. Step 2: Convert to fraction form
   1,443.89/2,161.36 = 784.13/x
3. Step 3: Cross multiply
   1,443.89x = 2,161.36 × 784.13
4. Step 4: Simplify right side
   1,443.89x = 1,694,790.66
5. Step 5: Solve for x
   x = 1,694,790.66/1,443.89
6. Step 6: Final answer
   x = 1,173.77