Finding the Fourth Proportional to 1,061.78, 1,465.02 and 619.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.78 : 1,465.02 = 619.79 : x
2. Step 2: Convert to fraction form
   1,061.78/1,465.02 = 619.79/x
3. Step 3: Cross multiply
   1,061.78x = 1,465.02 × 619.79
4. Step 4: Simplify right side
   1,061.78x = 907,997.42
5. Step 5: Solve for x
   x = 907,997.42/1,061.78
6. Step 6: Final answer
   x = 855.17