Finding the Third Proportional to 90,772 and 139,986

Step by Step Solution

1. Step 1: Write the proportion equation
   90,772 : 139,986 = 139,986 : x
2. Step 2: Convert to fraction form
   90,772/139,986 = 139,986/x
3. Step 3: Cross multiply
   90,772x = 139,986 × 139,986
4. Step 4: Simplify right side
   90,772x = 19,596,080,196
5. Step 5: Solve for x
   x = 19,596,080,196/90,772
6. Step 6: Final answer
   x = 215,882.43