Finding the Fourth Proportional to 100.50, 138.63 and 72.83

Step by Step Solution

1. Step 1: Write the proportion equation
   100.50 : 138.63 = 72.83 : x
2. Step 2: Convert to fraction form
   100.50/138.63 = 72.83/x
3. Step 3: Cross multiply
   100.50x = 138.63 × 72.83
4. Step 4: Simplify right side
   100.50x = 10,096.63
5. Step 5: Solve for x
   x = 10,096.63/100.50
6. Step 6: Final answer
   x = 100.47