Finding the Fourth Proportional to 1,238.31, 1,853.82 and 826.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238.31 : 1,853.82 = 826.43 : x
2. Step 2: Convert to fraction form
   1,238.31/1,853.82 = 826.43/x
3. Step 3: Cross multiply
   1,238.31x = 1,853.82 × 826.43
4. Step 4: Simplify right side
   1,238.31x = 1,532,043.19
5. Step 5: Solve for x
   x = 1,532,043.19/1,238.31
6. Step 6: Final answer
   x = 1,237.20