Finding the Third Proportional to 31,579.88 and 69,099.75

Step by Step Solution

1. Step 1: Write the proportion equation
   31,579.88 : 69,099.75 = 69,099.75 : x
2. Step 2: Convert to fraction form
   31,579.88/69,099.75 = 69,099.75/x
3. Step 3: Cross multiply
   31,579.88x = 69,099.75 × 69,099.75
4. Step 4: Simplify right side
   31,579.88x = 4,774,775,450.06
5. Step 5: Solve for x
   x = 4,774,775,450.06/31,579.88
6. Step 6: Final answer
   x = 151,196.78