Finding the Fourth Proportional to 111.32, 153.75 and 102.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 153.75 = 102.10 : x
2. Step 2: Convert to fraction form
   111.32/153.75 = 102.10/x
3. Step 3: Cross multiply
   111.32x = 153.75 × 102.10
4. Step 4: Simplify right side
   111.32x = 15,696.60
5. Step 5: Solve for x
   x = 15,696.60/111.32
6. Step 6: Final answer
   x = 141.00