Finding the Fourth Proportional to 1,061.85, 1,465.32 and 619.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.85 : 1,465.32 = 619.89 : x
2. Step 2: Convert to fraction form
   1,061.85/1,465.32 = 619.89/x
3. Step 3: Cross multiply
   1,061.85x = 1,465.32 × 619.89
4. Step 4: Simplify right side
   1,061.85x = 908,337.21
5. Step 5: Solve for x
   x = 908,337.21/1,061.85
6. Step 6: Final answer
   x = 855.43