Finding the Fourth Proportional to 1,328.79, 1,992.63 and 507.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328.79 : 1,992.63 = 507.27 : x
2. Step 2: Convert to fraction form
   1,328.79/1,992.63 = 507.27/x
3. Step 3: Cross multiply
   1,328.79x = 1,992.63 × 507.27
4. Step 4: Simplify right side
   1,328.79x = 1,010,801.42
5. Step 5: Solve for x
   x = 1,010,801.42/1,328.79
6. Step 6: Final answer
   x = 760.69