Finding the Fourth Proportional to 1,404.21, 1,937.78 and 774.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.21 : 1,937.78 = 774.79 : x
2. Step 2: Convert to fraction form
   1,404.21/1,937.78 = 774.79/x
3. Step 3: Cross multiply
   1,404.21x = 1,937.78 × 774.79
4. Step 4: Simplify right side
   1,404.21x = 1,501,368.69
5. Step 5: Solve for x
   x = 1,501,368.69/1,404.21
6. Step 6: Final answer
   x = 1,069.19