Finding the Fourth Proportional to 111.57, 153.91 and 70.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.57 : 153.91 = 70.10 : x
2. Step 2: Convert to fraction form
   111.57/153.91 = 70.10/x
3. Step 3: Cross multiply
   111.57x = 153.91 × 70.10
4. Step 4: Simplify right side
   111.57x = 10,788.99
5. Step 5: Solve for x
   x = 10,788.99/111.57
6. Step 6: Final answer
   x = 96.70