Finding the Fourth Proportional to 20,922.84, 28,870.02 and 12,539.34

Step by Step Solution

1. Step 1: Write the proportion equation
   20,922.84 : 28,870.02 = 12,539.34 : x
2. Step 2: Convert to fraction form
   20,922.84/28,870.02 = 12,539.34/x
3. Step 3: Cross multiply
   20,922.84x = 28,870.02 × 12,539.34
4. Step 4: Simplify right side
   20,922.84x = 362,010,996.59
5. Step 5: Solve for x
   x = 362,010,996.59/20,922.84
6. Step 6: Final answer
   x = 17,302.19