Finding the Fourth Proportional to 1,438.04, 1,983.51 and 1,389.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,438.04 : 1,983.51 = 1,389.83 : x
2. Step 2: Convert to fraction form
   1,438.04/1,983.51 = 1,389.83/x
3. Step 3: Cross multiply
   1,438.04x = 1,983.51 × 1,389.83
4. Step 4: Simplify right side
   1,438.04x = 2,756,731.79
5. Step 5: Solve for x
   x = 2,756,731.79/1,438.04
6. Step 6: Final answer
   x = 1,917.00