Finding the Fourth Proportional to 940.55, 1,297.94 and 520.88

Step by Step Solution

1. Step 1: Write the proportion equation
   940.55 : 1,297.94 = 520.88 : x
2. Step 2: Convert to fraction form
   940.55/1,297.94 = 520.88/x
3. Step 3: Cross multiply
   940.55x = 1,297.94 × 520.88
4. Step 4: Simplify right side
   940.55x = 676,061.89
5. Step 5: Solve for x
   x = 676,061.89/940.55
6. Step 6: Final answer
   x = 718.80