Finding the Fourth Proportional to 1,081.74, 1,620.27 and 619.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.74 : 1,620.27 = 619.29 : x
2. Step 2: Convert to fraction form
   1,081.74/1,620.27 = 619.29/x
3. Step 3: Cross multiply
   1,081.74x = 1,620.27 × 619.29
4. Step 4: Simplify right side
   1,081.74x = 1,003,417.01
5. Step 5: Solve for x
   x = 1,003,417.01/1,081.74
6. Step 6: Final answer
   x = 927.60