Finding the Fourth Proportional to 6,897.21, 9,518.34 and 3,913.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,897.21 : 9,518.34 = 3,913.50 : x
2. Step 2: Convert to fraction form
   6,897.21/9,518.34 = 3,913.50/x
3. Step 3: Cross multiply
   6,897.21x = 9,518.34 × 3,913.50
4. Step 4: Simplify right side
   6,897.21x = 37,250,023.59
5. Step 5: Solve for x
   x = 37,250,023.59/6,897.21
6. Step 6: Final answer
   x = 5,400.74