Finding the Fourth Proportional to 131.47, 181.42 and 72.46

Step by Step Solution

1. Step 1: Write the proportion equation
   131.47 : 181.42 = 72.46 : x
2. Step 2: Convert to fraction form
   131.47/181.42 = 72.46/x
3. Step 3: Cross multiply
   131.47x = 181.42 × 72.46
4. Step 4: Simplify right side
   131.47x = 13,145.69
5. Step 5: Solve for x
   x = 13,145.69/131.47
6. Step 6: Final answer
   x = 99.99