Finding the Third Proportional to 12,990.38 and 19,602.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,990.38 : 19,602.56 = 19,602.56 : x
2. Step 2: Convert to fraction form
   12,990.38/19,602.56 = 19,602.56/x
3. Step 3: Cross multiply
   12,990.38x = 19,602.56 × 19,602.56
4. Step 4: Simplify right side
   12,990.38x = 384,260,456.57
5. Step 5: Solve for x
   x = 384,260,456.57/12,990.38
6. Step 6: Final answer
   x = 29,580.40