Finding the Fourth Proportional to 111.70, 155.29 and 111.70

Step by Step Solution

1. Step 1: Write the proportion equation
   111.70 : 155.29 = 111.70 : x
2. Step 2: Convert to fraction form
   111.70/155.29 = 111.70/x
3. Step 3: Cross multiply
   111.70x = 155.29 × 111.70
4. Step 4: Simplify right side
   111.70x = 17,345.89
5. Step 5: Solve for x
   x = 17,345.89/111.70
6. Step 6: Final answer
   x = 155.29