Finding the Fourth Proportional to 1,300.66, 1,950.94 and 520.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.66 : 1,950.94 = 520.43 : x
2. Step 2: Convert to fraction form
   1,300.66/1,950.94 = 520.43/x
3. Step 3: Cross multiply
   1,300.66x = 1,950.94 × 520.43
4. Step 4: Simplify right side
   1,300.66x = 1,015,315.67
5. Step 5: Solve for x
   x = 1,015,315.67/1,300.66
6. Step 6: Final answer
   x = 780.62