Finding the Third Proportional to 13,137.75 and 19,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,137.75 : 19,978.88 = 19,978.88 : x
2. Step 2: Convert to fraction form
   13,137.75/19,978.88 = 19,978.88/x
3. Step 3: Cross multiply
   13,137.75x = 19,978.88 × 19,978.88
4. Step 4: Simplify right side
   13,137.75x = 399,155,446.27
5. Step 5: Solve for x
   x = 399,155,446.27/13,137.75
6. Step 6: Final answer
   x = 30,382.33