Finding the Fourth Proportional to 72,982.67, 109,471.98 and 20,390.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72,982.67 : 109,471.98 = 20,390.72 : x
2. Step 2: Convert to fraction form
   72,982.67/109,471.98 = 20,390.72/x
3. Step 3: Cross multiply
   72,982.67x = 109,471.98 × 20,390.72
4. Step 4: Simplify right side
   72,982.67x = 2,232,212,492.03
5. Step 5: Solve for x
   x = 2,232,212,492.03/72,982.67
6. Step 6: Final answer
   x = 30,585.51