Finding the Fourth Proportional to 20,902.06, 28,842.94 and 12,402.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,902.06 : 28,842.94 = 12,402.72 : x
2. Step 2: Convert to fraction form
   20,902.06/28,842.94 = 12,402.72/x
3. Step 3: Cross multiply
   20,902.06x = 28,842.94 × 12,402.72
4. Step 4: Simplify right side
   20,902.06x = 357,730,933.02
5. Step 5: Solve for x
   x = 357,730,933.02/20,902.06
6. Step 6: Final answer
   x = 17,114.62