Finding the Fourth Proportional to 71,675.21, 107,929.50 and 53,087.15

Step by Step Solution

1. Step 1: Write the proportion equation
   71,675.21 : 107,929.50 = 53,087.15 : x
2. Step 2: Convert to fraction form
   71,675.21/107,929.50 = 53,087.15/x
3. Step 3: Cross multiply
   71,675.21x = 107,929.50 × 53,087.15
4. Step 4: Simplify right side
   71,675.21x = 5,729,669,016.28
5. Step 5: Solve for x
   x = 5,729,669,016.28/71,675.21
6. Step 6: Final answer
   x = 79,939.35