Finding the Fourth Proportional to 111.25, 152.86 and 90.47

Step by Step Solution

1. Step 1: Write the proportion equation
   111.25 : 152.86 = 90.47 : x
2. Step 2: Convert to fraction form
   111.25/152.86 = 90.47/x
3. Step 3: Cross multiply
   111.25x = 152.86 × 90.47
4. Step 4: Simplify right side
   111.25x = 13,829.24
5. Step 5: Solve for x
   x = 13,829.24/111.25
6. Step 6: Final answer
   x = 124.31