Finding the Fourth Proportional to 1,404.48, 1,938.09 and 774.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.48 : 1,938.09 = 774.90 : x
2. Step 2: Convert to fraction form
   1,404.48/1,938.09 = 774.90/x
3. Step 3: Cross multiply
   1,404.48x = 1,938.09 × 774.90
4. Step 4: Simplify right side
   1,404.48x = 1,501,825.94
5. Step 5: Solve for x
   x = 1,501,825.94/1,404.48
6. Step 6: Final answer
   x = 1,069.31