Finding the Fourth Proportional to 72,405.38, 108,608.16 and 19,815.32

Step by Step Solution

1. Step 1: Write the proportion equation
   72,405.38 : 108,608.16 = 19,815.32 : x
2. Step 2: Convert to fraction form
   72,405.38/108,608.16 = 19,815.32/x
3. Step 3: Cross multiply
   72,405.38x = 108,608.16 × 19,815.32
4. Step 4: Simplify right side
   72,405.38x = 2,152,105,445.01
5. Step 5: Solve for x
   x = 2,152,105,445.01/72,405.38
6. Step 6: Final answer
   x = 29,723.00