Finding the Fourth Proportional to 1,137.50, 1,569.71 and 640.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,137.50 : 1,569.71 = 640.26 : x
2. Step 2: Convert to fraction form
   1,137.50/1,569.71 = 640.26/x
3. Step 3: Cross multiply
   1,137.50x = 1,569.71 × 640.26
4. Step 4: Simplify right side
   1,137.50x = 1,005,022.52
5. Step 5: Solve for x
   x = 1,005,022.52/1,137.50
6. Step 6: Final answer
   x = 883.54