Finding the Third Proportional to 42,907 and 66,436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,907 : 66,436.50 = 66,436.50 : x
2. Step 2: Convert to fraction form
   42,907/66,436.50 = 66,436.50/x
3. Step 3: Cross multiply
   42,907x = 66,436.50 × 66,436.50
4. Step 4: Simplify right side
   42,907x = 4,413,808,532.25
5. Step 5: Solve for x
   x = 4,413,808,532.25/42,907
6. Step 6: Final answer
   x = 102,869.19