Finding the Third Proportional to 156,639 and 252,211.69

Step by Step Solution

1. Step 1: Write the proportion equation
   156,639 : 252,211.69 = 252,211.69 : x
2. Step 2: Convert to fraction form
   156,639/252,211.69 = 252,211.69/x
3. Step 3: Cross multiply
   156,639x = 252,211.69 × 252,211.69
4. Step 4: Simplify right side
   156,639x = 63,610,735,311.60
5. Step 5: Solve for x
   x = 63,610,735,311.60/156,639
6. Step 6: Final answer
   x = 406,097.69