Finding the Fourth Proportional to 111.01, 153.01 and 78.21

Step by Step Solution

1. Step 1: Write the proportion equation
   111.01 : 153.01 = 78.21 : x
2. Step 2: Convert to fraction form
   111.01/153.01 = 78.21/x
3. Step 3: Cross multiply
   111.01x = 153.01 × 78.21
4. Step 4: Simplify right side
   111.01x = 11,966.91
5. Step 5: Solve for x
   x = 11,966.91/111.01
6. Step 6: Final answer
   x = 107.80