Finding the Fourth Proportional to 1,301.36, 1,951.04 and 520.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,301.36 : 1,951.04 = 520.72 : x
2. Step 2: Convert to fraction form
   1,301.36/1,951.04 = 520.72/x
3. Step 3: Cross multiply
   1,301.36x = 1,951.04 × 520.72
4. Step 4: Simplify right side
   1,301.36x = 1,015,945.55
5. Step 5: Solve for x
   x = 1,015,945.55/1,301.36
6. Step 6: Final answer
   x = 780.68