Finding the Third Proportional to 19,870 and 42,108.50

Step by Step Solution

1. Step 1: Write the proportion equation
   19,870 : 42,108.50 = 42,108.50 : x
2. Step 2: Convert to fraction form
   19,870/42,108.50 = 42,108.50/x
3. Step 3: Cross multiply
   19,870x = 42,108.50 × 42,108.50
4. Step 4: Simplify right side
   19,870x = 1,773,125,772.25
5. Step 5: Solve for x
   x = 1,773,125,772.25/19,870
6. Step 6: Final answer
   x = 89,236.32