Finding the Fourth Proportional to 1,399.01, 1,930.50 and 778.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.01 : 1,930.50 = 778.01 : x
2. Step 2: Convert to fraction form
   1,399.01/1,930.50 = 778.01/x
3. Step 3: Cross multiply
   1,399.01x = 1,930.50 × 778.01
4. Step 4: Simplify right side
   1,399.01x = 1,501,938.65
5. Step 5: Solve for x
   x = 1,501,938.65/1,399.01
6. Step 6: Final answer
   x = 1,073.58