Finding the Third Proportional to 12,915.31 and 19,948.93

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.31 : 19,948.93 = 19,948.93 : x
2. Step 2: Convert to fraction form
   12,915.31/19,948.93 = 19,948.93/x
3. Step 3: Cross multiply
   12,915.31x = 19,948.93 × 19,948.93
4. Step 4: Simplify right side
   12,915.31x = 397,959,790.81
5. Step 5: Solve for x
   x = 397,959,790.81/12,915.31
6. Step 6: Final answer
   x = 30,813.03