Finding the Fourth Proportional to 1,368.05, 1,887.91 and 778.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.05 : 1,887.91 = 778.70 : x
2. Step 2: Convert to fraction form
   1,368.05/1,887.91 = 778.70/x
3. Step 3: Cross multiply
   1,368.05x = 1,887.91 × 778.70
4. Step 4: Simplify right side
   1,368.05x = 1,470,118.29
5. Step 5: Solve for x
   x = 1,470,118.29/1,368.05
6. Step 6: Final answer
   x = 1,074.61