Finding the Third Proportional to 57,009 and 85,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,009 : 85,855.50 = 85,855.50 : x
2. Step 2: Convert to fraction form
   57,009/85,855.50 = 85,855.50/x
3. Step 3: Cross multiply
   57,009x = 85,855.50 × 85,855.50
4. Step 4: Simplify right side
   57,009x = 7,371,166,880.25
5. Step 5: Solve for x
   x = 7,371,166,880.25/57,009
6. Step 6: Final answer
   x = 129,298.30