Finding the Fourth Proportional to 72,465.72, 108,685.89 and 19,158.21

Step by Step Solution

1. Step 1: Write the proportion equation
   72,465.72 : 108,685.89 = 19,158.21 : x
2. Step 2: Convert to fraction form
   72,465.72/108,685.89 = 19,158.21/x
3. Step 3: Cross multiply
   72,465.72x = 108,685.89 × 19,158.21
4. Step 4: Simplify right side
   72,465.72x = 2,082,227,104.66
5. Step 5: Solve for x
   x = 2,082,227,104.66/72,465.72
6. Step 6: Final answer
   x = 28,733.96