Finding the Fourth Proportional to 116.31, 160.52 and 64.56

Step by Step Solution

1. Step 1: Write the proportion equation
   116.31 : 160.52 = 64.56 : x
2. Step 2: Convert to fraction form
   116.31/160.52 = 64.56/x
3. Step 3: Cross multiply
   116.31x = 160.52 × 64.56
4. Step 4: Simplify right side
   116.31x = 10,363.17
5. Step 5: Solve for x
   x = 10,363.17/116.31
6. Step 6: Final answer
   x = 89.10