Finding the Fourth Proportional to 6,987.55, 9,636.20 and 4,470.45

Step by Step Solution

1. Step 1: Write the proportion equation
   6,987.55 : 9,636.20 = 4,470.45 : x
2. Step 2: Convert to fraction form
   6,987.55/9,636.20 = 4,470.45/x
3. Step 3: Cross multiply
   6,987.55x = 9,636.20 × 4,470.45
4. Step 4: Simplify right side
   6,987.55x = 43,078,127.94
5. Step 5: Solve for x
   x = 43,078,127.94/6,987.55
6. Step 6: Final answer
   x = 6,164.99