Finding the Fourth Proportional to 13,390.56, 18,479.52 and 7,727.04

Step by Step Solution

1. Step 1: Write the proportion equation
   13,390.56 : 18,479.52 = 7,727.04 : x
2. Step 2: Convert to fraction form
   13,390.56/18,479.52 = 7,727.04/x
3. Step 3: Cross multiply
   13,390.56x = 18,479.52 × 7,727.04
4. Step 4: Simplify right side
   13,390.56x = 142,791,990.22
5. Step 5: Solve for x
   x = 142,791,990.22/13,390.56
6. Step 6: Final answer
   x = 10,663.63