Finding the Third Proportional to 139,617 and 221,940

Step by Step Solution

1. Step 1: Write the proportion equation
   139,617 : 221,940 = 221,940 : x
2. Step 2: Convert to fraction form
   139,617/221,940 = 221,940/x
3. Step 3: Cross multiply
   139,617x = 221,940 × 221,940
4. Step 4: Simplify right side
   139,617x = 49,257,363,600
5. Step 5: Solve for x
   x = 49,257,363,600/139,617
6. Step 6: Final answer
   x = 352,803.48