Finding the Fourth Proportional to 20,799.84, 28,695.56 and 12,828.18

Step by Step Solution

1. Step 1: Write the proportion equation
   20,799.84 : 28,695.56 = 12,828.18 : x
2. Step 2: Convert to fraction form
   20,799.84/28,695.56 = 12,828.18/x
3. Step 3: Cross multiply
   20,799.84x = 28,695.56 × 12,828.18
4. Step 4: Simplify right side
   20,799.84x = 368,111,808.88
5. Step 5: Solve for x
   x = 368,111,808.88/20,799.84
6. Step 6: Final answer
   x = 17,697.82