Finding the Fourth Proportional to 91.86, 126.72 and 60.81

Step by Step Solution

1. Step 1: Write the proportion equation
   91.86 : 126.72 = 60.81 : x
2. Step 2: Convert to fraction form
   91.86/126.72 = 60.81/x
3. Step 3: Cross multiply
   91.86x = 126.72 × 60.81
4. Step 4: Simplify right side
   91.86x = 7,705.84
5. Step 5: Solve for x
   x = 7,705.84/91.86
6. Step 6: Final answer
   x = 83.89