Finding the Fourth Proportional to 1,425.78, 1,967.57 and 836.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.78 : 1,967.57 = 836.21 : x
2. Step 2: Convert to fraction form
   1,425.78/1,967.57 = 836.21/x
3. Step 3: Cross multiply
   1,425.78x = 1,967.57 × 836.21
4. Step 4: Simplify right side
   1,425.78x = 1,645,287.69
5. Step 5: Solve for x
   x = 1,645,287.69/1,425.78
6. Step 6: Final answer
   x = 1,153.95