Finding the Fourth Proportional to 12,945.90, 17,867.11 and 7,569.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.90 : 17,867.11 = 7,569.98 : x
2. Step 2: Convert to fraction form
   12,945.90/17,867.11 = 7,569.98/x
3. Step 3: Cross multiply
   12,945.90x = 17,867.11 × 7,569.98
4. Step 4: Simplify right side
   12,945.90x = 135,253,667.25
5. Step 5: Solve for x
   x = 135,253,667.25/12,945.90
6. Step 6: Final answer
   x = 10,447.61