Finding the Fourth Proportional to 72,479.92, 108,715.02 and 19,885

Step by Step Solution

1. Step 1: Write the proportion equation
   72,479.92 : 108,715.02 = 19,885 : x
2. Step 2: Convert to fraction form
   72,479.92/108,715.02 = 19,885/x
3. Step 3: Cross multiply
   72,479.92x = 108,715.02 × 19,885
4. Step 4: Simplify right side
   72,479.92x = 2,161,798,172.70
5. Step 5: Solve for x
   x = 2,161,798,172.70/72,479.92
6. Step 6: Final answer
   x = 29,826.17