Finding the Fourth Proportional to 1,385.43, 2,076.33 and 1,238.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.43 : 2,076.33 = 1,238.31 : x
2. Step 2: Convert to fraction form
   1,385.43/2,076.33 = 1,238.31/x
3. Step 3: Cross multiply
   1,385.43x = 2,076.33 × 1,238.31
4. Step 4: Simplify right side
   1,385.43x = 2,571,140.20
5. Step 5: Solve for x
   x = 2,571,140.20/1,385.43
6. Step 6: Final answer
   x = 1,855.84