Finding the Fourth Proportional to 13,003.60, 17,947.72 and 8,220.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,003.60 : 17,947.72 = 8,220.48 : x
2. Step 2: Convert to fraction form
   13,003.60/17,947.72 = 8,220.48/x
3. Step 3: Cross multiply
   13,003.60x = 17,947.72 × 8,220.48
4. Step 4: Simplify right side
   13,003.60x = 147,538,873.31
5. Step 5: Solve for x
   x = 147,538,873.31/13,003.60
6. Step 6: Final answer
   x = 11,346.00