Finding the Third Proportional to 78,129 and 110,623.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,129 : 110,623.50 = 110,623.50 : x
2. Step 2: Convert to fraction form
   78,129/110,623.50 = 110,623.50/x
3. Step 3: Cross multiply
   78,129x = 110,623.50 × 110,623.50
4. Step 4: Simplify right side
   78,129x = 12,237,558,752.25
5. Step 5: Solve for x
   x = 12,237,558,752.25/78,129
6. Step 6: Final answer
   x = 156,632.73