Finding the Fourth Proportional to 99.06, 136.72 and 57.63

Step by Step Solution

1. Step 1: Write the proportion equation
   99.06 : 136.72 = 57.63 : x
2. Step 2: Convert to fraction form
   99.06/136.72 = 57.63/x
3. Step 3: Cross multiply
   99.06x = 136.72 × 57.63
4. Step 4: Simplify right side
   99.06x = 7,878.89
5. Step 5: Solve for x
   x = 7,878.89/99.06
6. Step 6: Final answer
   x = 79.54