Finding the Fourth Proportional to 1,948.80, 2,920.56 and 854.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,948.80 : 2,920.56 = 854.10 : x
2. Step 2: Convert to fraction form
   1,948.80/2,920.56 = 854.10/x
3. Step 3: Cross multiply
   1,948.80x = 2,920.56 × 854.10
4. Step 4: Simplify right side
   1,948.80x = 2,494,450.30
5. Step 5: Solve for x
   x = 2,494,450.30/1,948.80
6. Step 6: Final answer
   x = 1,279.99