Finding the Fourth Proportional to 61.14, 91.50 and 56.61

Step by Step Solution

1. Step 1: Write the proportion equation
   61.14 : 91.50 = 56.61 : x
2. Step 2: Convert to fraction form
   61.14/91.50 = 56.61/x
3. Step 3: Cross multiply
   61.14x = 91.50 × 56.61
4. Step 4: Simplify right side
   61.14x = 5,179.82
5. Step 5: Solve for x
   x = 5,179.82/61.14
6. Step 6: Final answer
   x = 84.72