Finding the Fourth Proportional to 1,116.72, 1,541.06 and 644.44

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.72 : 1,541.06 = 644.44 : x
2. Step 2: Convert to fraction form
   1,116.72/1,541.06 = 644.44/x
3. Step 3: Cross multiply
   1,116.72x = 1,541.06 × 644.44
4. Step 4: Simplify right side
   1,116.72x = 993,120.71
5. Step 5: Solve for x
   x = 993,120.71/1,116.72
6. Step 6: Final answer
   x = 889.32