Finding the Third Proportional to 90.13 and 207.31

Step by Step Solution

1. Step 1: Write the proportion equation
   90.13 : 207.31 = 207.31 : x
2. Step 2: Convert to fraction form
   90.13/207.31 = 207.31/x
3. Step 3: Cross multiply
   90.13x = 207.31 × 207.31
4. Step 4: Simplify right side
   90.13x = 42,978.47
5. Step 5: Solve for x
   x = 42,978.47/90.13
6. Step 6: Final answer
   x = 476.88