Finding the Fourth Proportional to 1,300.42, 1,951.41 and 520.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.42 : 1,951.41 = 520.81 : x
2. Step 2: Convert to fraction form
   1,300.42/1,951.41 = 520.81/x
3. Step 3: Cross multiply
   1,300.42x = 1,951.41 × 520.81
4. Step 4: Simplify right side
   1,300.42x = 1,016,313.84
5. Step 5: Solve for x
   x = 1,016,313.84/1,300.42
6. Step 6: Final answer
   x = 781.53