Finding the Fourth Proportional to 71,379.72, 107,061.08 and 18,793.31

Step by Step Solution

1. Step 1: Write the proportion equation
   71,379.72 : 107,061.08 = 18,793.31 : x
2. Step 2: Convert to fraction form
   71,379.72/107,061.08 = 18,793.31/x
3. Step 3: Cross multiply
   71,379.72x = 107,061.08 × 18,793.31
4. Step 4: Simplify right side
   71,379.72x = 2,012,031,436.10
5. Step 5: Solve for x
   x = 2,012,031,436.10/71,379.72
6. Step 6: Final answer
   x = 28,187.72