Finding the Third Proportional to 139,816.13 and 212,746.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,816.13 : 212,746.50 = 212,746.50 : x
2. Step 2: Convert to fraction form
   139,816.13/212,746.50 = 212,746.50/x
3. Step 3: Cross multiply
   139,816.13x = 212,746.50 × 212,746.50
4. Step 4: Simplify right side
   139,816.13x = 45,261,073,262.25
5. Step 5: Solve for x
   x = 45,261,073,262.25/139,816.13
6. Step 6: Final answer
   x = 323,718.55