Finding the Fourth Proportional to 1,371.56, 1,892.82 and 782.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.56 : 1,892.82 = 782.21 : x
2. Step 2: Convert to fraction form
   1,371.56/1,892.82 = 782.21/x
3. Step 3: Cross multiply
   1,371.56x = 1,892.82 × 782.21
4. Step 4: Simplify right side
   1,371.56x = 1,480,573.27
5. Step 5: Solve for x
   x = 1,480,573.27/1,371.56
6. Step 6: Final answer
   x = 1,079.49