Finding the Fourth Proportional to 140.61, 194.10 and 90.15

Step by Step Solution

1. Step 1: Write the proportion equation
   140.61 : 194.10 = 90.15 : x
2. Step 2: Convert to fraction form
   140.61/194.10 = 90.15/x
3. Step 3: Cross multiply
   140.61x = 194.10 × 90.15
4. Step 4: Simplify right side
   140.61x = 17,498.69
5. Step 5: Solve for x
   x = 17,498.69/140.61
6. Step 6: Final answer
   x = 124.45