Finding the Fourth Proportional to 7,064.38, 9,748.88 and 3,920.57

Step by Step Solution

1. Step 1: Write the proportion equation
   7,064.38 : 9,748.88 = 3,920.57 : x
2. Step 2: Convert to fraction form
   7,064.38/9,748.88 = 3,920.57/x
3. Step 3: Cross multiply
   7,064.38x = 9,748.88 × 3,920.57
4. Step 4: Simplify right side
   7,064.38x = 38,221,117.72
5. Step 5: Solve for x
   x = 38,221,117.72/7,064.38
6. Step 6: Final answer
   x = 5,410.40