Finding the Fourth Proportional to 1,368.06, 1,887.76 and 778.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.06 : 1,887.76 = 778.56 : x
2. Step 2: Convert to fraction form
   1,368.06/1,887.76 = 778.56/x
3. Step 3: Cross multiply
   1,368.06x = 1,887.76 × 778.56
4. Step 4: Simplify right side
   1,368.06x = 1,469,734.43
5. Step 5: Solve for x
   x = 1,469,734.43/1,368.06
6. Step 6: Final answer
   x = 1,074.32