Finding the Third Proportional to 76,890 and 103,459.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,890 : 103,459.50 = 103,459.50 : x
2. Step 2: Convert to fraction form
   76,890/103,459.50 = 103,459.50/x
3. Step 3: Cross multiply
   76,890x = 103,459.50 × 103,459.50
4. Step 4: Simplify right side
   76,890x = 10,703,868,140.25
5. Step 5: Solve for x
   x = 10,703,868,140.25/76,890
6. Step 6: Final answer
   x = 139,210.15