Finding the Fourth Proportional to 1,061.66, 1,465.09 and 619.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.66 : 1,465.09 = 619.86 : x
2. Step 2: Convert to fraction form
   1,061.66/1,465.09 = 619.86/x
3. Step 3: Cross multiply
   1,061.66x = 1,465.09 × 619.86
4. Step 4: Simplify right side
   1,061.66x = 908,150.69
5. Step 5: Solve for x
   x = 908,150.69/1,061.66
6. Step 6: Final answer
   x = 855.41