Finding the Fourth Proportional to 1,438.47, 2,156.58 and 1,323.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.47 : 2,156.58 = 1,323.15 : x
2. Step 2: Convert to fraction form
   1,438.47/2,156.58 = 1,323.15/x
3. Step 3: Cross multiply
   1,438.47x = 2,156.58 × 1,323.15
4. Step 4: Simplify right side
   1,438.47x = 2,853,478.83
5. Step 5: Solve for x
   x = 2,853,478.83/1,438.47
6. Step 6: Final answer
   x = 1,983.69