Finding the Fourth Proportional to 1,091.91, 1,506.77 and 619.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.91 : 1,506.77 = 619.82 : x
2. Step 2: Convert to fraction form
   1,091.91/1,506.77 = 619.82/x
3. Step 3: Cross multiply
   1,091.91x = 1,506.77 × 619.82
4. Step 4: Simplify right side
   1,091.91x = 933,926.18
5. Step 5: Solve for x
   x = 933,926.18/1,091.91
6. Step 6: Final answer
   x = 855.31