Finding the Fourth Proportional to 13,335.02, 18,391.83 and 12,440.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,335.02 : 18,391.83 = 12,440.78 : x
2. Step 2: Convert to fraction form
   13,335.02/18,391.83 = 12,440.78/x
3. Step 3: Cross multiply
   13,335.02x = 18,391.83 × 12,440.78
4. Step 4: Simplify right side
   13,335.02x = 228,808,710.83
5. Step 5: Solve for x
   x = 228,808,710.83/13,335.02
6. Step 6: Final answer
   x = 17,158.48