Finding the Fourth Proportional to 2,639.34, 3,959.37 and 907.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.34 : 3,959.37 = 907.50 : x
2. Step 2: Convert to fraction form
   2,639.34/3,959.37 = 907.50/x
3. Step 3: Cross multiply
   2,639.34x = 3,959.37 × 907.50
4. Step 4: Simplify right side
   2,639.34x = 3,593,128.28
5. Step 5: Solve for x
   x = 3,593,128.28/2,639.34
6. Step 6: Final answer
   x = 1,361.37