Finding the Third Proportional to 12,931 and 19,772.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931 : 19,772.50 = 19,772.50 : x
2. Step 2: Convert to fraction form
   12,931/19,772.50 = 19,772.50/x
3. Step 3: Cross multiply
   12,931x = 19,772.50 × 19,772.50
4. Step 4: Simplify right side
   12,931x = 390,951,756.25
5. Step 5: Solve for x
   x = 390,951,756.25/12,931
6. Step 6: Final answer
   x = 30,233.68