Finding the Fourth Proportional to 1,398.94, 1,930.55 and 777.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.94 : 1,930.55 = 777.94 : x
2. Step 2: Convert to fraction form
   1,398.94/1,930.55 = 777.94/x
3. Step 3: Cross multiply
   1,398.94x = 1,930.55 × 777.94
4. Step 4: Simplify right side
   1,398.94x = 1,501,843.35
5. Step 5: Solve for x
   x = 1,501,843.35/1,398.94
6. Step 6: Final answer
   x = 1,073.56