Finding the Fourth Proportional to 12,381.50, 17,078.91 and 8,133.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,381.50 : 17,078.91 = 8,133.05 : x
2. Step 2: Convert to fraction form
   12,381.50/17,078.91 = 8,133.05/x
3. Step 3: Cross multiply
   12,381.50x = 17,078.91 × 8,133.05
4. Step 4: Simplify right side
   12,381.50x = 138,903,628.98
5. Step 5: Solve for x
   x = 138,903,628.98/12,381.50
6. Step 6: Final answer
   x = 11,218.64