Finding the Fourth Proportional to 1,334.74, 1,842.15 and 775.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,334.74 : 1,842.15 = 775.21 : x
2. Step 2: Convert to fraction form
   1,334.74/1,842.15 = 775.21/x
3. Step 3: Cross multiply
   1,334.74x = 1,842.15 × 775.21
4. Step 4: Simplify right side
   1,334.74x = 1,428,053.10
5. Step 5: Solve for x
   x = 1,428,053.10/1,334.74
6. Step 6: Final answer
   x = 1,069.91