Finding the Fourth Proportional to 707.72, 1,061.34 and 274.76

Step by Step Solution

1. Step 1: Write the proportion equation
   707.72 : 1,061.34 = 274.76 : x
2. Step 2: Convert to fraction form
   707.72/1,061.34 = 274.76/x
3. Step 3: Cross multiply
   707.72x = 1,061.34 × 274.76
4. Step 4: Simplify right side
   707.72x = 291,613.78
5. Step 5: Solve for x
   x = 291,613.78/707.72
6. Step 6: Final answer
   x = 412.05