Finding the Third Proportional to 72,120.19 and 156,939.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72,120.19 : 156,939.56 = 156,939.56 : x
2. Step 2: Convert to fraction form
   72,120.19/156,939.56 = 156,939.56/x
3. Step 3: Cross multiply
   72,120.19x = 156,939.56 × 156,939.56
4. Step 4: Simplify right side
   72,120.19x = 24,630,026,277.69
5. Step 5: Solve for x
   x = 24,630,026,277.69/72,120.19
6. Step 6: Final answer
   x = 341,513.62