Finding the Fourth Proportional to 1,399.08, 1,930.66 and 777.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.08 : 1,930.66 = 777.96 : x
2. Step 2: Convert to fraction form
   1,399.08/1,930.66 = 777.96/x
3. Step 3: Cross multiply
   1,399.08x = 1,930.66 × 777.96
4. Step 4: Simplify right side
   1,399.08x = 1,501,976.25
5. Step 5: Solve for x
   x = 1,501,976.25/1,399.08
6. Step 6: Final answer
   x = 1,073.55