Finding the Third Proportional to 91,816 and 139,560

Step by Step Solution

1. Step 1: Write the proportion equation
   91,816 : 139,560 = 139,560 : x
2. Step 2: Convert to fraction form
   91,816/139,560 = 139,560/x
3. Step 3: Cross multiply
   91,816x = 139,560 × 139,560
4. Step 4: Simplify right side
   91,816x = 19,476,993,600
5. Step 5: Solve for x
   x = 19,476,993,600/91,816
6. Step 6: Final answer
   x = 212,130.71