Finding the Third Proportional to 111,639 and 156,156

Step by Step Solution

1. Step 1: Write the proportion equation
   111,639 : 156,156 = 156,156 : x
2. Step 2: Convert to fraction form
   111,639/156,156 = 156,156/x
3. Step 3: Cross multiply
   111,639x = 156,156 × 156,156
4. Step 4: Simplify right side
   111,639x = 24,384,696,336
5. Step 5: Solve for x
   x = 24,384,696,336/111,639
6. Step 6: Final answer
   x = 218,424.53