Finding the Fourth Proportional to 6,820.47, 9,414.18 and 3,988.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,820.47 : 9,414.18 = 3,988.50 : x
2. Step 2: Convert to fraction form
   6,820.47/9,414.18 = 3,988.50/x
3. Step 3: Cross multiply
   6,820.47x = 9,414.18 × 3,988.50
4. Step 4: Simplify right side
   6,820.47x = 37,548,456.93
5. Step 5: Solve for x
   x = 37,548,456.93/6,820.47
6. Step 6: Final answer
   x = 5,505.26