Finding the Third Proportional to 42,699 and 68,212.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,699 : 68,212.50 = 68,212.50 : x
2. Step 2: Convert to fraction form
   42,699/68,212.50 = 68,212.50/x
3. Step 3: Cross multiply
   42,699x = 68,212.50 × 68,212.50
4. Step 4: Simplify right side
   42,699x = 4,652,945,156.25
5. Step 5: Solve for x
   x = 4,652,945,156.25/42,699
6. Step 6: Final answer
   x = 108,970.82