Finding the Fourth Proportional to 131.60, 181.61 and 72.59

Step by Step Solution

1. Step 1: Write the proportion equation
   131.60 : 181.61 = 72.59 : x
2. Step 2: Convert to fraction form
   131.60/181.61 = 72.59/x
3. Step 3: Cross multiply
   131.60x = 181.61 × 72.59
4. Step 4: Simplify right side
   131.60x = 13,181.80
5. Step 5: Solve for x
   x = 13,181.80/131.60
6. Step 6: Final answer
   x = 100.17