Finding the Fourth Proportional to 1,061.94, 1,465.64 and 619.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.94 : 1,465.64 = 619.78 : x
2. Step 2: Convert to fraction form
   1,061.94/1,465.64 = 619.78/x
3. Step 3: Cross multiply
   1,061.94x = 1,465.64 × 619.78
4. Step 4: Simplify right side
   1,061.94x = 908,374.36
5. Step 5: Solve for x
   x = 908,374.36/1,061.94
6. Step 6: Final answer
   x = 855.39