Finding the Third Proportional to 42,109.50 and 61,521

Step by Step Solution

1. Step 1: Write the proportion equation
   42,109.50 : 61,521 = 61,521 : x
2. Step 2: Convert to fraction form
   42,109.50/61,521 = 61,521/x
3. Step 3: Cross multiply
   42,109.50x = 61,521 × 61,521
4. Step 4: Simplify right side
   42,109.50x = 3,784,833,441
5. Step 5: Solve for x
   x = 3,784,833,441/42,109.50
6. Step 6: Final answer
   x = 89,880.75