Finding the Fourth Proportional to 13,259.62, 19,871.78 and 7,018.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,259.62 : 19,871.78 = 7,018.30 : x
2. Step 2: Convert to fraction form
   13,259.62/19,871.78 = 7,018.30/x
3. Step 3: Cross multiply
   13,259.62x = 19,871.78 × 7,018.30
4. Step 4: Simplify right side
   13,259.62x = 139,466,113.57
5. Step 5: Solve for x
   x = 139,466,113.57/13,259.62
6. Step 6: Final answer
   x = 10,518.11