Finding the Fourth Proportional to 13,320.51, 18,382.76 and 7,656.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,320.51 : 18,382.76 = 7,656.31 : x
2. Step 2: Convert to fraction form
   13,320.51/18,382.76 = 7,656.31/x
3. Step 3: Cross multiply
   13,320.51x = 18,382.76 × 7,656.31
4. Step 4: Simplify right side
   13,320.51x = 140,744,109.22
5. Step 5: Solve for x
   x = 140,744,109.22/13,320.51
6. Step 6: Final answer
   x = 10,565.97