Finding the Fourth Proportional to 1,371.88, 1,893.20 and 782.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.88 : 1,893.20 = 782.46 : x
2. Step 2: Convert to fraction form
   1,371.88/1,893.20 = 782.46/x
3. Step 3: Cross multiply
   1,371.88x = 1,893.20 × 782.46
4. Step 4: Simplify right side
   1,371.88x = 1,481,353.27
5. Step 5: Solve for x
   x = 1,481,353.27/1,371.88
6. Step 6: Final answer
   x = 1,079.80