Finding the Fourth Proportional to 1,061.84, 1,465.56 and 619.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.84 : 1,465.56 = 619.80 : x
2. Step 2: Convert to fraction form
   1,061.84/1,465.56 = 619.80/x
3. Step 3: Cross multiply
   1,061.84x = 1,465.56 × 619.80
4. Step 4: Simplify right side
   1,061.84x = 908,354.09
5. Step 5: Solve for x
   x = 908,354.09/1,061.84
6. Step 6: Final answer
   x = 855.45