Finding the Fourth Proportional to 1,113.46, 1,536.45 and 641.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.46 : 1,536.45 = 641.35 : x
2. Step 2: Convert to fraction form
   1,113.46/1,536.45 = 641.35/x
3. Step 3: Cross multiply
   1,113.46x = 1,536.45 × 641.35
4. Step 4: Simplify right side
   1,113.46x = 985,401.72
5. Step 5: Solve for x
   x = 985,401.72/1,113.46
6. Step 6: Final answer
   x = 884.99