Finding the Fourth Proportional to 13,389.71, 18,462.38 and 10,864.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,389.71 : 18,462.38 = 10,864.02 : x
2. Step 2: Convert to fraction form
   13,389.71/18,462.38 = 10,864.02/x
3. Step 3: Cross multiply
   13,389.71x = 18,462.38 × 10,864.02
4. Step 4: Simplify right side
   13,389.71x = 200,575,741.59
5. Step 5: Solve for x
   x = 200,575,741.59/13,389.71
6. Step 6: Final answer
   x = 14,979.85