Finding the Third Proportional to 68,156 and 139,712

Step by Step Solution

1. Step 1: Write the proportion equation
   68,156 : 139,712 = 139,712 : x
2. Step 2: Convert to fraction form
   68,156/139,712 = 139,712/x
3. Step 3: Cross multiply
   68,156x = 139,712 × 139,712
4. Step 4: Simplify right side
   68,156x = 19,519,442,944
5. Step 5: Solve for x
   x = 19,519,442,944/68,156
6. Step 6: Final answer
   x = 286,393.61