Finding the Fourth Proportional to 1,116.73, 1,541.31 and 644.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.73 : 1,541.31 = 644.93 : x
2. Step 2: Convert to fraction form
   1,116.73/1,541.31 = 644.93/x
3. Step 3: Cross multiply
   1,116.73x = 1,541.31 × 644.93
4. Step 4: Simplify right side
   1,116.73x = 994,033.83
5. Step 5: Solve for x
   x = 994,033.83/1,116.73
6. Step 6: Final answer
   x = 890.13