Finding the Fourth Proportional to 111.52, 153.90 and 67.90

Step by Step Solution

1. Step 1: Write the proportion equation
   111.52 : 153.90 = 67.90 : x
2. Step 2: Convert to fraction form
   111.52/153.90 = 67.90/x
3. Step 3: Cross multiply
   111.52x = 153.90 × 67.90
4. Step 4: Simplify right side
   111.52x = 10,449.81
5. Step 5: Solve for x
   x = 10,449.81/111.52
6. Step 6: Final answer
   x = 93.70