Finding the Third Proportional to 1,388.39 and 2,061.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.39 : 2,061.70 = 2,061.70 : x
2. Step 2: Convert to fraction form
   1,388.39/2,061.70 = 2,061.70/x
3. Step 3: Cross multiply
   1,388.39x = 2,061.70 × 2,061.70
4. Step 4: Simplify right side
   1,388.39x = 4,250,619.78
5. Step 5: Solve for x
   x = 4,250,619.78/1,388.39
6. Step 6: Final answer
   x = 3,061.54