Finding the Fourth Proportional to 6,987.69, 9,642.86 and 3,801.05

Step by Step Solution

1. Step 1: Write the proportion equation
   6,987.69 : 9,642.86 = 3,801.05 : x
2. Step 2: Convert to fraction form
   6,987.69/9,642.86 = 3,801.05/x
3. Step 3: Cross multiply
   6,987.69x = 9,642.86 × 3,801.05
4. Step 4: Simplify right side
   6,987.69x = 36,652,925.78
5. Step 5: Solve for x
   x = 36,652,925.78/6,987.69
6. Step 6: Final answer
   x = 5,245.36