Finding the Fourth Proportional to 72,213.91, 99,653.33 and 39,947.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72,213.91 : 99,653.33 = 39,947.69 : x
2. Step 2: Convert to fraction form
   72,213.91/99,653.33 = 39,947.69/x
3. Step 3: Cross multiply
   72,213.91x = 99,653.33 × 39,947.69
4. Step 4: Simplify right side
   72,213.91x = 3,980,919,836.04
5. Step 5: Solve for x
   x = 3,980,919,836.04/72,213.91
6. Step 6: Final answer
   x = 55,126.78