Finding the Fourth Proportional to 1,375.93, 1,898.76 and 778.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.93 : 1,898.76 = 778.42 : x
2. Step 2: Convert to fraction form
   1,375.93/1,898.76 = 778.42/x
3. Step 3: Cross multiply
   1,375.93x = 1,898.76 × 778.42
4. Step 4: Simplify right side
   1,375.93x = 1,478,023.27
5. Step 5: Solve for x
   x = 1,478,023.27/1,375.93
6. Step 6: Final answer
   x = 1,074.20