Finding the Third Proportional to 90.31 and 191.88

Step by Step Solution

1. Step 1: Write the proportion equation
   90.31 : 191.88 = 191.88 : x
2. Step 2: Convert to fraction form
   90.31/191.88 = 191.88/x
3. Step 3: Cross multiply
   90.31x = 191.88 × 191.88
4. Step 4: Simplify right side
   90.31x = 36,816.02
5. Step 5: Solve for x
   x = 36,816.02/90.31
6. Step 6: Final answer
   x = 407.65