Finding the Third Proportional to 129,912.50 and 279,164

Step by Step Solution

1. Step 1: Write the proportion equation
   129,912.50 : 279,164 = 279,164 : x
2. Step 2: Convert to fraction form
   129,912.50/279,164 = 279,164/x
3. Step 3: Cross multiply
   129,912.50x = 279,164 × 279,164
4. Step 4: Simplify right side
   129,912.50x = 77,932,538,896
5. Step 5: Solve for x
   x = 77,932,538,896/129,912.50
6. Step 6: Final answer
   x = 599,884.84