Finding the Third Proportional to 53.79 and 99.91

Step by Step Solution

1. Step 1: Write the proportion equation
   53.79 : 99.91 = 99.91 : x
2. Step 2: Convert to fraction form
   53.79/99.91 = 99.91/x
3. Step 3: Cross multiply
   53.79x = 99.91 × 99.91
4. Step 4: Simplify right side
   53.79x = 9,982.82
5. Step 5: Solve for x
   x = 9,982.82/53.79
6. Step 6: Final answer
   x = 185.59