Finding the Fourth Proportional to 20,934.71, 28,870.05 and 13,751.99

Step by Step Solution

1. Step 1: Write the proportion equation
   20,934.71 : 28,870.05 = 13,751.99 : x
2. Step 2: Convert to fraction form
   20,934.71/28,870.05 = 13,751.99/x
3. Step 3: Cross multiply
   20,934.71x = 28,870.05 × 13,751.99
4. Step 4: Simplify right side
   20,934.71x = 397,020,638.90
5. Step 5: Solve for x
   x = 397,020,638.90/20,934.71
6. Step 6: Final answer
   x = 18,964.71