Finding the Third Proportional to 19,872.88 and 42,115

Step by Step Solution

1. Step 1: Write the proportion equation
   19,872.88 : 42,115 = 42,115 : x
2. Step 2: Convert to fraction form
   19,872.88/42,115 = 42,115/x
3. Step 3: Cross multiply
   19,872.88x = 42,115 × 42,115
4. Step 4: Simplify right side
   19,872.88x = 1,773,673,225
5. Step 5: Solve for x
   x = 1,773,673,225/19,872.88
6. Step 6: Final answer
   x = 89,250.96