Finding the Fourth Proportional to 1,141.82, 1,575.63 and 644.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.82 : 1,575.63 = 644.51 : x
2. Step 2: Convert to fraction form
   1,141.82/1,575.63 = 644.51/x
3. Step 3: Cross multiply
   1,141.82x = 1,575.63 × 644.51
4. Step 4: Simplify right side
   1,141.82x = 1,015,502.55
5. Step 5: Solve for x
   x = 1,015,502.55/1,141.82
6. Step 6: Final answer
   x = 889.37