Finding the Fourth Proportional to 1,425.52, 2,136.82 and 776.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.52 : 2,136.82 = 776.80 : x
2. Step 2: Convert to fraction form
   1,425.52/2,136.82 = 776.80/x
3. Step 3: Cross multiply
   1,425.52x = 2,136.82 × 776.80
4. Step 4: Simplify right side
   1,425.52x = 1,659,881.78
5. Step 5: Solve for x
   x = 1,659,881.78/1,425.52
6. Step 6: Final answer
   x = 1,164.40