Finding the Fourth Proportional to 72,972.65, 109,245.72 and 65,968.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,972.65 : 109,245.72 = 65,968.78 : x
2. Step 2: Convert to fraction form
   72,972.65/109,245.72 = 65,968.78/x
3. Step 3: Cross multiply
   72,972.65x = 109,245.72 × 65,968.78
4. Step 4: Simplify right side
   72,972.65x = 7,206,806,868.62
5. Step 5: Solve for x
   x = 7,206,806,868.62/72,972.65
6. Step 6: Final answer
   x = 98,760.39