Finding the Fourth Proportional to 6,810.15, 10,212.42 and 2,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   6,810.15 : 10,212.42 = 2,128.59 : x
2. Step 2: Convert to fraction form
   6,810.15/10,212.42 = 2,128.59/x
3. Step 3: Cross multiply
   6,810.15x = 10,212.42 × 2,128.59
4. Step 4: Simplify right side
   6,810.15x = 21,738,055.09
5. Step 5: Solve for x
   x = 21,738,055.09/6,810.15
6. Step 6: Final answer
   x = 3,192.01