Finding the Third Proportional to 51,631.50 and 78,931.38

Step by Step Solution

1. Step 1: Write the proportion equation
   51,631.50 : 78,931.38 = 78,931.38 : x
2. Step 2: Convert to fraction form
   51,631.50/78,931.38 = 78,931.38/x
3. Step 3: Cross multiply
   51,631.50x = 78,931.38 × 78,931.38
4. Step 4: Simplify right side
   51,631.50x = 6,230,161,959.39
5. Step 5: Solve for x
   x = 6,230,161,959.39/51,631.50
6. Step 6: Final answer
   x = 120,665.91