Finding the Fourth Proportional to 71.43, 98.61 and 53.92

Step by Step Solution

1. Step 1: Write the proportion equation
   71.43 : 98.61 = 53.92 : x
2. Step 2: Convert to fraction form
   71.43/98.61 = 53.92/x
3. Step 3: Cross multiply
   71.43x = 98.61 × 53.92
4. Step 4: Simplify right side
   71.43x = 5,316.78
5. Step 5: Solve for x
   x = 5,316.78/71.43
6. Step 6: Final answer
   x = 74.44