Finding the Fourth Proportional to 1,010.17, 1,391.98 and 774.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,010.17 : 1,391.98 = 774.12 : x
2. Step 2: Convert to fraction form
   1,010.17/1,391.98 = 774.12/x
3. Step 3: Cross multiply
   1,010.17x = 1,391.98 × 774.12
4. Step 4: Simplify right side
   1,010.17x = 1,077,559.56
5. Step 5: Solve for x
   x = 1,077,559.56/1,010.17
6. Step 6: Final answer
   x = 1,066.71