Finding the Fourth Proportional to 61.68, 91.86 and 57.94

Step by Step Solution

1. Step 1: Write the proportion equation
   61.68 : 91.86 = 57.94 : x
2. Step 2: Convert to fraction form
   61.68/91.86 = 57.94/x
3. Step 3: Cross multiply
   61.68x = 91.86 × 57.94
4. Step 4: Simplify right side
   61.68x = 5,322.37
5. Step 5: Solve for x
   x = 5,322.37/61.68
6. Step 6: Final answer
   x = 86.29