Finding the Third Proportional to 99.31 and 145.76

Step by Step Solution

1. Step 1: Write the proportion equation
   99.31 : 145.76 = 145.76 : x
2. Step 2: Convert to fraction form
   99.31/145.76 = 145.76/x
3. Step 3: Cross multiply
   99.31x = 145.76 × 145.76
4. Step 4: Simplify right side
   99.31x = 21,247.26
5. Step 5: Solve for x
   x = 21,247.26/99.31
6. Step 6: Final answer
   x = 213.94