Finding the Fourth Proportional to 1,113.52, 1,536.55 and 641.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.52 : 1,536.55 = 641.29 : x
2. Step 2: Convert to fraction form
   1,113.52/1,536.55 = 641.29/x
3. Step 3: Cross multiply
   1,113.52x = 1,536.55 × 641.29
4. Step 4: Simplify right side
   1,113.52x = 985,374.15
5. Step 5: Solve for x
   x = 985,374.15/1,113.52
6. Step 6: Final answer
   x = 884.92