Finding the Fourth Proportional to 1,300.79, 1,951.18 and 520.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.79 : 1,951.18 = 520.99 : x
2. Step 2: Convert to fraction form
   1,300.79/1,951.18 = 520.99/x
3. Step 3: Cross multiply
   1,300.79x = 1,951.18 × 520.99
4. Step 4: Simplify right side
   1,300.79x = 1,016,532.91
5. Step 5: Solve for x
   x = 1,016,532.91/1,300.79
6. Step 6: Final answer
   x = 781.47