Finding the Fourth Proportional to 13,039.40, 19,562.70 and 4,280.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,039.40 : 19,562.70 = 4,280.42 : x
2. Step 2: Convert to fraction form
   13,039.40/19,562.70 = 4,280.42/x
3. Step 3: Cross multiply
   13,039.40x = 19,562.70 × 4,280.42
4. Step 4: Simplify right side
   13,039.40x = 83,736,572.33
5. Step 5: Solve for x
   x = 83,736,572.33/13,039.40
6. Step 6: Final answer
   x = 6,421.81