Finding the Fourth Proportional to 1,007.22, 1,389.86 and 581.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.22 : 1,389.86 = 581.82 : x
2. Step 2: Convert to fraction form
   1,007.22/1,389.86 = 581.82/x
3. Step 3: Cross multiply
   1,007.22x = 1,389.86 × 581.82
4. Step 4: Simplify right side
   1,007.22x = 808,648.35
5. Step 5: Solve for x
   x = 808,648.35/1,007.22
6. Step 6: Final answer
   x = 802.85