Finding the Fourth Proportional to 1,217.34, 1,679.34 and 774.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.34 : 1,679.34 = 774.72 : x
2. Step 2: Convert to fraction form
   1,217.34/1,679.34 = 774.72/x
3. Step 3: Cross multiply
   1,217.34x = 1,679.34 × 774.72
4. Step 4: Simplify right side
   1,217.34x = 1,301,018.28
5. Step 5: Solve for x
   x = 1,301,018.28/1,217.34
6. Step 6: Final answer
   x = 1,068.74