Finding the Fourth Proportional to 6,985.55, 9,642.47 and 4,191.05

Step by Step Solution

1. Step 1: Write the proportion equation
   6,985.55 : 9,642.47 = 4,191.05 : x
2. Step 2: Convert to fraction form
   6,985.55/9,642.47 = 4,191.05/x
3. Step 3: Cross multiply
   6,985.55x = 9,642.47 × 4,191.05
4. Step 4: Simplify right side
   6,985.55x = 40,412,004.73
5. Step 5: Solve for x
   x = 40,412,004.73/6,985.55
6. Step 6: Final answer
   x = 5,785.09