Finding the Fourth Proportional to 13,718.64, 18,931.83 and 7,431.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,718.64 : 18,931.83 = 7,431.15 : x
2. Step 2: Convert to fraction form
   13,718.64/18,931.83 = 7,431.15/x
3. Step 3: Cross multiply
   13,718.64x = 18,931.83 × 7,431.15
4. Step 4: Simplify right side
   13,718.64x = 140,685,268.50
5. Step 5: Solve for x
   x = 140,685,268.50/13,718.64
6. Step 6: Final answer
   x = 10,255.04