Finding the Third Proportional to 31,278 and 63,830

Step by Step Solution

1. Step 1: Write the proportion equation
   31,278 : 63,830 = 63,830 : x
2. Step 2: Convert to fraction form
   31,278/63,830 = 63,830/x
3. Step 3: Cross multiply
   31,278x = 63,830 × 63,830
4. Step 4: Simplify right side
   31,278x = 4,074,268,900
5. Step 5: Solve for x
   x = 4,074,268,900/31,278
6. Step 6: Final answer
   x = 130,259.89