Finding the Fourth Proportional to 72,120.88, 108,168.78 and 19,518.04

Step by Step Solution

1. Step 1: Write the proportion equation
   72,120.88 : 108,168.78 = 19,518.04 : x
2. Step 2: Convert to fraction form
   72,120.88/108,168.78 = 19,518.04/x
3. Step 3: Cross multiply
   72,120.88x = 108,168.78 × 19,518.04
4. Step 4: Simplify right side
   72,120.88x = 2,111,242,574.79
5. Step 5: Solve for x
   x = 2,111,242,574.79/72,120.88
6. Step 6: Final answer
   x = 29,273.67