Finding the Fourth Proportional to 1,371.50, 1,892.79 and 781.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,371.50 : 1,892.79 = 781.82 : x
2. Step 2: Convert to fraction form
   1,371.50/1,892.79 = 781.82/x
3. Step 3: Cross multiply
   1,371.50x = 1,892.79 × 781.82
4. Step 4: Simplify right side
   1,371.50x = 1,479,821.08
5. Step 5: Solve for x
   x = 1,479,821.08/1,371.50
6. Step 6: Final answer
   x = 1,078.98