Finding the Fourth Proportional to 1,061.97, 1,465.53 and 619.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.97 : 1,465.53 = 619.78 : x
2. Step 2: Convert to fraction form
   1,061.97/1,465.53 = 619.78/x
3. Step 3: Cross multiply
   1,061.97x = 1,465.53 × 619.78
4. Step 4: Simplify right side
   1,061.97x = 908,306.75
5. Step 5: Solve for x
   x = 908,306.75/1,061.97
6. Step 6: Final answer
   x = 855.31