Finding the Third Proportional to 535 and 1,287.63

Step by Step Solution

1. Step 1: Write the proportion equation
   535 : 1,287.63 = 1,287.63 : x
2. Step 2: Convert to fraction form
   535/1,287.63 = 1,287.63/x
3. Step 3: Cross multiply
   535x = 1,287.63 × 1,287.63
4. Step 4: Simplify right side
   535x = 1,657,978.14
5. Step 5: Solve for x
   x = 1,657,978.14/535
6. Step 6: Final answer
   x = 3,099.02