Finding the Fourth Proportional to 8,361.79, 12,533.20 and 3,428.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,361.79 : 12,533.20 = 3,428.69 : x
2. Step 2: Convert to fraction form
   8,361.79/12,533.20 = 3,428.69/x
3. Step 3: Cross multiply
   8,361.79x = 12,533.20 × 3,428.69
4. Step 4: Simplify right side
   8,361.79x = 42,972,386.27
5. Step 5: Solve for x
   x = 42,972,386.27/8,361.79
6. Step 6: Final answer
   x = 5,139.14