Finding the Third Proportional to 8,442.56 and 13,090.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,442.56 : 13,090.78 = 13,090.78 : x
2. Step 2: Convert to fraction form
   8,442.56/13,090.78 = 13,090.78/x
3. Step 3: Cross multiply
   8,442.56x = 13,090.78 × 13,090.78
4. Step 4: Simplify right side
   8,442.56x = 171,368,553.74
5. Step 5: Solve for x
   x = 171,368,553.74/8,442.56
6. Step 6: Final answer
   x = 20,298.17