Finding the Fourth Proportional to 1,368.43, 1,888.49 and 778.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.43 : 1,888.49 = 778.95 : x
2. Step 2: Convert to fraction form
   1,368.43/1,888.49 = 778.95/x
3. Step 3: Cross multiply
   1,368.43x = 1,888.49 × 778.95
4. Step 4: Simplify right side
   1,368.43x = 1,471,041.23
5. Step 5: Solve for x
   x = 1,471,041.23/1,368.43
6. Step 6: Final answer
   x = 1,074.99