Finding the Fourth Proportional to 1,091.82, 1,506.78 and 619.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.82 : 1,506.78 = 619.72 : x
2. Step 2: Convert to fraction form
   1,091.82/1,506.78 = 619.72/x
3. Step 3: Cross multiply
   1,091.82x = 1,506.78 × 619.72
4. Step 4: Simplify right side
   1,091.82x = 933,781.70
5. Step 5: Solve for x
   x = 933,781.70/1,091.82
6. Step 6: Final answer
   x = 855.25