Finding the Third Proportional to 1,388.63 and 2,066.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.63 : 2,066.63 = 2,066.63 : x
2. Step 2: Convert to fraction form
   1,388.63/2,066.63 = 2,066.63/x
3. Step 3: Cross multiply
   1,388.63x = 2,066.63 × 2,066.63
4. Step 4: Simplify right side
   1,388.63x = 4,270,938.89
5. Step 5: Solve for x
   x = 4,270,938.89/1,388.63
6. Step 6: Final answer
   x = 3,075.66