Finding the Fourth Proportional to 111.98, 167.90 and 75.80

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 167.90 = 75.80 : x
2. Step 2: Convert to fraction form
   111.98/167.90 = 75.80/x
3. Step 3: Cross multiply
   111.98x = 167.90 × 75.80
4. Step 4: Simplify right side
   111.98x = 12,726.82
5. Step 5: Solve for x
   x = 12,726.82/111.98
6. Step 6: Final answer
   x = 113.65