Finding the Fourth Proportional to 97.72, 134.72 and 83.88

Step by Step Solution

1. Step 1: Write the proportion equation
   97.72 : 134.72 = 83.88 : x
2. Step 2: Convert to fraction form
   97.72/134.72 = 83.88/x
3. Step 3: Cross multiply
   97.72x = 134.72 × 83.88
4. Step 4: Simplify right side
   97.72x = 11,300.31
5. Step 5: Solve for x
   x = 11,300.31/97.72
6. Step 6: Final answer
   x = 115.64