Finding the Fourth Proportional to 72,016.68, 108,023.74 and 19,431.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,016.68 : 108,023.74 = 19,431.72 : x
2. Step 2: Convert to fraction form
   72,016.68/108,023.74 = 19,431.72/x
3. Step 3: Cross multiply
   72,016.68x = 108,023.74 × 19,431.72
4. Step 4: Simplify right side
   72,016.68x = 2,099,087,069.03
5. Step 5: Solve for x
   x = 2,099,087,069.03/72,016.68
6. Step 6: Final answer
   x = 29,147.23