Finding the Fourth Proportional to 72,940.40, 109,345.80 and 65,067.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,940.40 : 109,345.80 = 65,067.20 : x
2. Step 2: Convert to fraction form
   72,940.40/109,345.80 = 65,067.20/x
3. Step 3: Cross multiply
   72,940.40x = 109,345.80 × 65,067.20
4. Step 4: Simplify right side
   72,940.40x = 7,114,825,037.76
5. Step 5: Solve for x
   x = 7,114,825,037.76/72,940.40
6. Step 6: Final answer
   x = 97,542.99