Finding the Fourth Proportional to 109,234.12, 150,665.40 and 72,917.28

Step by Step Solution

1. Step 1: Write the proportion equation
   109,234.12 : 150,665.40 = 72,917.28 : x
2. Step 2: Convert to fraction form
   109,234.12/150,665.40 = 72,917.28/x
3. Step 3: Cross multiply
   109,234.12x = 150,665.40 × 72,917.28
4. Step 4: Simplify right side
   109,234.12x = 10,986,111,158.11
5. Step 5: Solve for x
   x = 10,986,111,158.11/109,234.12
6. Step 6: Final answer
   x = 100,573.99