Finding the Fourth Proportional to 1,141.96, 1,575.86 and 644.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,141.96 : 1,575.86 = 644.52 : x
2. Step 2: Convert to fraction form
   1,141.96/1,575.86 = 644.52/x
3. Step 3: Cross multiply
   1,141.96x = 1,575.86 × 644.52
4. Step 4: Simplify right side
   1,141.96x = 1,015,673.29
5. Step 5: Solve for x
   x = 1,015,673.29/1,141.96
6. Step 6: Final answer
   x = 889.41