Finding the Fourth Proportional to 61.16, 91.89 and 53.06

Step by Step Solution

1. Step 1: Write the proportion equation
   61.16 : 91.89 = 53.06 : x
2. Step 2: Convert to fraction form
   61.16/91.89 = 53.06/x
3. Step 3: Cross multiply
   61.16x = 91.89 × 53.06
4. Step 4: Simplify right side
   61.16x = 4,875.22
5. Step 5: Solve for x
   x = 4,875.22/61.16
6. Step 6: Final answer
   x = 79.72