Finding the Fourth Proportional to 61.31, 91.89 and 34.18

Step by Step Solution

1. Step 1: Write the proportion equation
   61.31 : 91.89 = 34.18 : x
2. Step 2: Convert to fraction form
   61.31/91.89 = 34.18/x
3. Step 3: Cross multiply
   61.31x = 91.89 × 34.18
4. Step 4: Simplify right side
   61.31x = 3,140.57
5. Step 5: Solve for x
   x = 3,140.57/61.31
6. Step 6: Final answer
   x = 51.22