Finding the Fourth Proportional to 91.83, 126.69 and 60.78

Step by Step Solution

1. Step 1: Write the proportion equation
   91.83 : 126.69 = 60.78 : x
2. Step 2: Convert to fraction form
   91.83/126.69 = 60.78/x
3. Step 3: Cross multiply
   91.83x = 126.69 × 60.78
4. Step 4: Simplify right side
   91.83x = 7,700.22
5. Step 5: Solve for x
   x = 7,700.22/91.83
6. Step 6: Final answer
   x = 83.85