Finding the Fourth Proportional to 348.34, 522.50 and 142.91

Step by Step Solution

1. Step 1: Write the proportion equation
   348.34 : 522.50 = 142.91 : x
2. Step 2: Convert to fraction form
   348.34/522.50 = 142.91/x
3. Step 3: Cross multiply
   348.34x = 522.50 × 142.91
4. Step 4: Simplify right side
   348.34x = 74,667.15
5. Step 5: Solve for x
   x = 74,667.15/348.34
6. Step 6: Final answer
   x = 214.35