Finding the Fourth Proportional to 1,561.38, 2,341.94 and 636.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.38 : 2,341.94 = 636.69 : x
2. Step 2: Convert to fraction form
   1,561.38/2,341.94 = 636.69/x
3. Step 3: Cross multiply
   1,561.38x = 2,341.94 × 636.69
4. Step 4: Simplify right side
   1,561.38x = 1,491,086.60
5. Step 5: Solve for x
   x = 1,491,086.60/1,561.38
6. Step 6: Final answer
   x = 954.98