Finding the Fourth Proportional to 13,385.64, 19,997.00 and 8,667.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,385.64 : 19,997.00 = 8,667.18 : x
2. Step 2: Convert to fraction form
   13,385.64/19,997.00 = 8,667.18/x
3. Step 3: Cross multiply
   13,385.64x = 19,997.00 × 8,667.18
4. Step 4: Simplify right side
   13,385.64x = 173,317,555.12
5. Step 5: Solve for x
   x = 173,317,555.12/13,385.64
6. Step 6: Final answer
   x = 12,948.02