Finding the Fourth Proportional to 7,019.28, 9,686.34 and 3,875.40

Step by Step Solution

1. Step 1: Write the proportion equation
   7,019.28 : 9,686.34 = 3,875.40 : x
2. Step 2: Convert to fraction form
   7,019.28/9,686.34 = 3,875.40/x
3. Step 3: Cross multiply
   7,019.28x = 9,686.34 × 3,875.40
4. Step 4: Simplify right side
   7,019.28x = 37,538,442.04
5. Step 5: Solve for x
   x = 37,538,442.04/7,019.28
6. Step 6: Final answer
   x = 5,347.90