Finding the Fourth Proportional to 1,425.33, 2,136.72 and 767.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.33 : 2,136.72 = 767.56 : x
2. Step 2: Convert to fraction form
   1,425.33/2,136.72 = 767.56/x
3. Step 3: Cross multiply
   1,425.33x = 2,136.72 × 767.56
4. Step 4: Simplify right side
   1,425.33x = 1,640,060.80
5. Step 5: Solve for x
   x = 1,640,060.80/1,425.33
6. Step 6: Final answer
   x = 1,150.65