Finding the Fourth Proportional to 1,091.83, 1,506.64 and 619.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.83 : 1,506.64 = 619.73 : x
2. Step 2: Convert to fraction form
   1,091.83/1,506.64 = 619.73/x
3. Step 3: Cross multiply
   1,091.83x = 1,506.64 × 619.73
4. Step 4: Simplify right side
   1,091.83x = 933,710.01
5. Step 5: Solve for x
   x = 933,710.01/1,091.83
6. Step 6: Final answer
   x = 855.18