Finding the Fourth Proportional to 1,948.72, 2,920.34 and 850.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,948.72 : 2,920.34 = 850.80 : x
2. Step 2: Convert to fraction form
   1,948.72/2,920.34 = 850.80/x
3. Step 3: Cross multiply
   1,948.72x = 2,920.34 × 850.80
4. Step 4: Simplify right side
   1,948.72x = 2,484,625.27
5. Step 5: Solve for x
   x = 2,484,625.27/1,948.72
6. Step 6: Final answer
   x = 1,275.00