Finding the Third Proportional to 12,603 and 19,930.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,603 : 19,930.50 = 19,930.50 : x
2. Step 2: Convert to fraction form
   12,603/19,930.50 = 19,930.50/x
3. Step 3: Cross multiply
   12,603x = 19,930.50 × 19,930.50
4. Step 4: Simplify right side
   12,603x = 397,224,830.25
5. Step 5: Solve for x
   x = 397,224,830.25/12,603
6. Step 6: Final answer
   x = 31,518.28