Finding the Fourth Proportional to 116.72, 161.30 and 100.52

Step by Step Solution

1. Step 1: Write the proportion equation
   116.72 : 161.30 = 100.52 : x
2. Step 2: Convert to fraction form
   116.72/161.30 = 100.52/x
3. Step 3: Cross multiply
   116.72x = 161.30 × 100.52
4. Step 4: Simplify right side
   116.72x = 16,213.37
5. Step 5: Solve for x
   x = 16,213.37/116.72
6. Step 6: Final answer
   x = 138.91