Finding the Third Proportional to 12,090 and 26,245.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,090 : 26,245.50 = 26,245.50 : x
2. Step 2: Convert to fraction form
   12,090/26,245.50 = 26,245.50/x
3. Step 3: Cross multiply
   12,090x = 26,245.50 × 26,245.50
4. Step 4: Simplify right side
   12,090x = 688,826,270.25
5. Step 5: Solve for x
   x = 688,826,270.25/12,090
6. Step 6: Final answer
   x = 56,974.88