Finding the Fourth Proportional to 129,842.37, 179,181.72 and 72,478.37

Step by Step Solution

1. Step 1: Write the proportion equation
   129,842.37 : 179,181.72 = 72,478.37 : x
2. Step 2: Convert to fraction form
   129,842.37/179,181.72 = 72,478.37/x
3. Step 3: Cross multiply
   129,842.37x = 179,181.72 × 72,478.37
4. Step 4: Simplify right side
   129,842.37x = 12,986,798,103.49
5. Step 5: Solve for x
   x = 12,986,798,103.49/129,842.37
6. Step 6: Final answer
   x = 100,019.72