Finding the Fourth Proportional to 72,741.28, 109,111.12 and 19,433.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,741.28 : 109,111.12 = 19,433.20 : x
2. Step 2: Convert to fraction form
   72,741.28/109,111.12 = 19,433.20/x
3. Step 3: Cross multiply
   72,741.28x = 109,111.12 × 19,433.20
4. Step 4: Simplify right side
   72,741.28x = 2,120,378,217.18
5. Step 5: Solve for x
   x = 2,120,378,217.18/72,741.28
6. Step 6: Final answer
   x = 29,149.59