Finding the Fourth Proportional to 1,061.72, 1,465.22 and 619.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.72 : 1,465.22 = 619.66 : x
2. Step 2: Convert to fraction form
   1,061.72/1,465.22 = 619.66/x
3. Step 3: Cross multiply
   1,061.72x = 1,465.22 × 619.66
4. Step 4: Simplify right side
   1,061.72x = 907,938.23
5. Step 5: Solve for x
   x = 907,938.23/1,061.72
6. Step 6: Final answer
   x = 855.16