Finding the Fourth Proportional to 940.72, 1,298.24 and 521.12

Step by Step Solution

1. Step 1: Write the proportion equation
   940.72 : 1,298.24 = 521.12 : x
2. Step 2: Convert to fraction form
   940.72/1,298.24 = 521.12/x
3. Step 3: Cross multiply
   940.72x = 1,298.24 × 521.12
4. Step 4: Simplify right side
   940.72x = 676,538.83
5. Step 5: Solve for x
   x = 676,538.83/940.72
6. Step 6: Final answer
   x = 719.17