Finding the Fourth Proportional to 152.86, 210.82 and 103.72

Step by Step Solution

1. Step 1: Write the proportion equation
   152.86 : 210.82 = 103.72 : x
2. Step 2: Convert to fraction form
   152.86/210.82 = 103.72/x
3. Step 3: Cross multiply
   152.86x = 210.82 × 103.72
4. Step 4: Simplify right side
   152.86x = 21,866.25
5. Step 5: Solve for x
   x = 21,866.25/152.86
6. Step 6: Final answer
   x = 143.05