Finding the Fourth Proportional to 103.02, 141.82 and 90.07

Step by Step Solution

1. Step 1: Write the proportion equation
   103.02 : 141.82 = 90.07 : x
2. Step 2: Convert to fraction form
   103.02/141.82 = 90.07/x
3. Step 3: Cross multiply
   103.02x = 141.82 × 90.07
4. Step 4: Simplify right side
   103.02x = 12,773.73
5. Step 5: Solve for x
   x = 12,773.73/103.02
6. Step 6: Final answer
   x = 123.99