Finding the Fourth Proportional to 152.18, 210.29 and 100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   152.18 : 210.29 = 100.50 : x
2. Step 2: Convert to fraction form
   152.18/210.29 = 100.50/x
3. Step 3: Cross multiply
   152.18x = 210.29 × 100.50
4. Step 4: Simplify right side
   152.18x = 21,134.15
5. Step 5: Solve for x
   x = 21,134.15/152.18
6. Step 6: Final answer
   x = 138.88