Finding the Third Proportional to 12,099 and 28,405.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,099 : 28,405.50 = 28,405.50 : x
2. Step 2: Convert to fraction form
   12,099/28,405.50 = 28,405.50/x
3. Step 3: Cross multiply
   12,099x = 28,405.50 × 28,405.50
4. Step 4: Simplify right side
   12,099x = 806,872,430.25
5. Step 5: Solve for x
   x = 806,872,430.25/12,099
6. Step 6: Final answer
   x = 66,689.18