Finding the Fourth Proportional to 13,019.60, 17,965.86 and 7,713.56

Step by Step Solution

1. Step 1: Write the proportion equation
   13,019.60 : 17,965.86 = 7,713.56 : x
2. Step 2: Convert to fraction form
   13,019.60/17,965.86 = 7,713.56/x
3. Step 3: Cross multiply
   13,019.60x = 17,965.86 × 7,713.56
4. Step 4: Simplify right side
   13,019.60x = 138,580,739.06
5. Step 5: Solve for x
   x = 138,580,739.06/13,019.60
6. Step 6: Final answer
   x = 10,644.01