Finding the Fourth Proportional to 12,931.12, 17,827.32 and 10,390.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,931.12 : 17,827.32 = 10,390.96 : x
2. Step 2: Convert to fraction form
   12,931.12/17,827.32 = 10,390.96/x
3. Step 3: Cross multiply
   12,931.12x = 17,827.32 × 10,390.96
4. Step 4: Simplify right side
   12,931.12x = 185,242,969.03
5. Step 5: Solve for x
   x = 185,242,969.03/12,931.12
6. Step 6: Final answer
   x = 14,325.36