Finding the Fourth Proportional to 1,371.88, 1,891.23 and 978.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.88 : 1,891.23 = 978.22 : x
2. Step 2: Convert to fraction form
   1,371.88/1,891.23 = 978.22/x
3. Step 3: Cross multiply
   1,371.88x = 1,891.23 × 978.22
4. Step 4: Simplify right side
   1,371.88x = 1,850,039.01
5. Step 5: Solve for x
   x = 1,850,039.01/1,371.88
6. Step 6: Final answer
   x = 1,348.54