Finding the Fourth Proportional to 1,137.36, 1,569.52 and 640.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,137.36 : 1,569.52 = 640.10 : x
2. Step 2: Convert to fraction form
   1,137.36/1,569.52 = 640.10/x
3. Step 3: Cross multiply
   1,137.36x = 1,569.52 × 640.10
4. Step 4: Simplify right side
   1,137.36x = 1,004,654.48
5. Step 5: Solve for x
   x = 1,004,654.48/1,137.36
6. Step 6: Final answer
   x = 883.32