Finding the Fourth Proportional to 142.91, 214.34 and 46.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142.91 : 214.34 = 46.72 : x
2. Step 2: Convert to fraction form
   142.91/214.34 = 46.72/x
3. Step 3: Cross multiply
   142.91x = 214.34 × 46.72
4. Step 4: Simplify right side
   142.91x = 10,014.17
5. Step 5: Solve for x
   x = 10,014.17/142.91
6. Step 6: Final answer
   x = 70.07