Finding the Fourth Proportional to 111.60, 153.98 and 70.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.60 : 153.98 = 70.15 : x
2. Step 2: Convert to fraction form
   111.60/153.98 = 70.15/x
3. Step 3: Cross multiply
   111.60x = 153.98 × 70.15
4. Step 4: Simplify right side
   111.60x = 10,801.70
5. Step 5: Solve for x
   x = 10,801.70/111.60
6. Step 6: Final answer
   x = 96.79