Finding the Fourth Proportional to 1,425.47, 2,136.57 and 766.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.47 : 2,136.57 = 766.57 : x
2. Step 2: Convert to fraction form
   1,425.47/2,136.57 = 766.57/x
3. Step 3: Cross multiply
   1,425.47x = 2,136.57 × 766.57
4. Step 4: Simplify right side
   1,425.47x = 1,637,830.46
5. Step 5: Solve for x
   x = 1,637,830.46/1,425.47
6. Step 6: Final answer
   x = 1,148.98