Finding the Fourth Proportional to 152.69, 210.72 and 90.52

Step by Step Solution

1. Step 1: Write the proportion equation
   152.69 : 210.72 = 90.52 : x
2. Step 2: Convert to fraction form
   152.69/210.72 = 90.52/x
3. Step 3: Cross multiply
   152.69x = 210.72 × 90.52
4. Step 4: Simplify right side
   152.69x = 19,074.90
5. Step 5: Solve for x
   x = 19,074.90/152.69
6. Step 6: Final answer
   x = 124.92