Finding the Fourth Proportional to 152.50, 228.72 and 42.81

Step by Step Solution

1. Step 1: Write the proportion equation
   152.50 : 228.72 = 42.81 : x
2. Step 2: Convert to fraction form
   152.50/228.72 = 42.81/x
3. Step 3: Cross multiply
   152.50x = 228.72 × 42.81
4. Step 4: Simplify right side
   152.50x = 9,791.50
5. Step 5: Solve for x
   x = 9,791.50/152.50
6. Step 6: Final answer
   x = 64.21