Finding the Fourth Proportional to 1,282.56, 1,769.88 and 715.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,282.56 : 1,769.88 = 715.37 : x
2. Step 2: Convert to fraction form
   1,282.56/1,769.88 = 715.37/x
3. Step 3: Cross multiply
   1,282.56x = 1,769.88 × 715.37
4. Step 4: Simplify right side
   1,282.56x = 1,266,119.06
5. Step 5: Solve for x
   x = 1,266,119.06/1,282.56
6. Step 6: Final answer
   x = 987.18