Finding the Fourth Proportional to 140.48, 210.72 and 59.31

Step by Step Solution

1. Step 1: Write the proportion equation
   140.48 : 210.72 = 59.31 : x
2. Step 2: Convert to fraction form
   140.48/210.72 = 59.31/x
3. Step 3: Cross multiply
   140.48x = 210.72 × 59.31
4. Step 4: Simplify right side
   140.48x = 12,498.48
5. Step 5: Solve for x
   x = 12,498.48/140.48
6. Step 6: Final answer
   x = 88.97