Finding the Fourth Proportional to 61.09, 91.59 and 28.59

Step by Step Solution

1. Step 1: Write the proportion equation
   61.09 : 91.59 = 28.59 : x
2. Step 2: Convert to fraction form
   61.09/91.59 = 28.59/x
3. Step 3: Cross multiply
   61.09x = 91.59 × 28.59
4. Step 4: Simplify right side
   61.09x = 2,618.56
5. Step 5: Solve for x
   x = 2,618.56/61.09
6. Step 6: Final answer
   x = 42.86