Finding the Fourth Proportional to 61.29, 91.91 and 43.05

Step by Step Solution

1. Step 1: Write the proportion equation
   61.29 : 91.91 = 43.05 : x
2. Step 2: Convert to fraction form
   61.29/91.91 = 43.05/x
3. Step 3: Cross multiply
   61.29x = 91.91 × 43.05
4. Step 4: Simplify right side
   61.29x = 3,956.51
5. Step 5: Solve for x
   x = 3,956.51/61.29
6. Step 6: Final answer
   x = 64.55