Finding the Fourth Proportional to 61.37, 91.72 and 56.51

Step by Step Solution

1. Step 1: Write the proportion equation
   61.37 : 91.72 = 56.51 : x
2. Step 2: Convert to fraction form
   61.37/91.72 = 56.51/x
3. Step 3: Cross multiply
   61.37x = 91.72 × 56.51
4. Step 4: Simplify right side
   61.37x = 5,182.71
5. Step 5: Solve for x
   x = 5,182.71/61.37
6. Step 6: Final answer
   x = 84.45