Finding the Fourth Proportional to 90.10, 124.31 and 59.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90.10 : 124.31 = 59.05 : x
2. Step 2: Convert to fraction form
   90.10/124.31 = 59.05/x
3. Step 3: Cross multiply
   90.10x = 124.31 × 59.05
4. Step 4: Simplify right side
   90.10x = 7,340.51
5. Step 5: Solve for x
   x = 7,340.51/90.10
6. Step 6: Final answer
   x = 81.47