Finding the Third Proportional to 78,824.50 and 172,979

Step by Step Solution

1. Step 1: Write the proportion equation
   78,824.50 : 172,979 = 172,979 : x
2. Step 2: Convert to fraction form
   78,824.50/172,979 = 172,979/x
3. Step 3: Cross multiply
   78,824.50x = 172,979 × 172,979
4. Step 4: Simplify right side
   78,824.50x = 29,921,734,441
5. Step 5: Solve for x
   x = 29,921,734,441/78,824.50
6. Step 6: Final answer
   x = 379,599.42