Finding the Third Proportional to 139,260 and 212,154

Step by Step Solution

1. Step 1: Write the proportion equation
   139,260 : 212,154 = 212,154 : x
2. Step 2: Convert to fraction form
   139,260/212,154 = 212,154/x
3. Step 3: Cross multiply
   139,260x = 212,154 × 212,154
4. Step 4: Simplify right side
   139,260x = 45,009,319,716
5. Step 5: Solve for x
   x = 45,009,319,716/139,260
6. Step 6: Final answer
   x = 323,203.50