Finding the Fourth Proportional to 6,780.38, 10,164.15 and 5,111.91

Step by Step Solution

1. Step 1: Write the proportion equation
   6,780.38 : 10,164.15 = 5,111.91 : x
2. Step 2: Convert to fraction form
   6,780.38/10,164.15 = 5,111.91/x
3. Step 3: Cross multiply
   6,780.38x = 10,164.15 × 5,111.91
4. Step 4: Simplify right side
   6,780.38x = 51,958,220.03
5. Step 5: Solve for x
   x = 51,958,220.03/6,780.38
6. Step 6: Final answer
   x = 7,663.03