Finding the Third Proportional to 9,090.50 and 12,278.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,090.50 : 12,278.50 = 12,278.50 : x
2. Step 2: Convert to fraction form
   9,090.50/12,278.50 = 12,278.50/x
3. Step 3: Cross multiply
   9,090.50x = 12,278.50 × 12,278.50
4. Step 4: Simplify right side
   9,090.50x = 150,761,562.25
5. Step 5: Solve for x
   x = 150,761,562.25/9,090.50
6. Step 6: Final answer
   x = 16,584.52