Finding the Third Proportional to 30,172.50 and 64,946.81

Step by Step Solution

1. Step 1: Write the proportion equation
   30,172.50 : 64,946.81 = 64,946.81 : x
2. Step 2: Convert to fraction form
   30,172.50/64,946.81 = 64,946.81/x
3. Step 3: Cross multiply
   30,172.50x = 64,946.81 × 64,946.81
4. Step 4: Simplify right side
   30,172.50x = 4,218,088,453.91
5. Step 5: Solve for x
   x = 4,218,088,453.91/30,172.50
6. Step 6: Final answer
   x = 139,799.10