Finding the Fourth Proportional to 1,301.10, 1,950.45 and 520.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,301.10 : 1,950.45 = 520.71 : x
2. Step 2: Convert to fraction form
   1,301.10/1,950.45 = 520.71/x
3. Step 3: Cross multiply
   1,301.10x = 1,950.45 × 520.71
4. Step 4: Simplify right side
   1,301.10x = 1,015,618.82
5. Step 5: Solve for x
   x = 1,015,618.82/1,301.10
6. Step 6: Final answer
   x = 780.58