Finding the Fourth Proportional to 95.90, 142.89 and 91.98

Step by Step Solution

1. Step 1: Write the proportion equation
   95.90 : 142.89 = 91.98 : x
2. Step 2: Convert to fraction form
   95.90/142.89 = 91.98/x
3. Step 3: Cross multiply
   95.90x = 142.89 × 91.98
4. Step 4: Simplify right side
   95.90x = 13,142.68
5. Step 5: Solve for x
   x = 13,142.68/95.90
6. Step 6: Final answer
   x = 137.05