Finding the Fourth Proportional to 12,998.67, 17,931.81 and 8,520.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,998.67 : 17,931.81 = 8,520.45 : x
2. Step 2: Convert to fraction form
   12,998.67/17,931.81 = 8,520.45/x
3. Step 3: Cross multiply
   12,998.67x = 17,931.81 × 8,520.45
4. Step 4: Simplify right side
   12,998.67x = 152,787,090.51
5. Step 5: Solve for x
   x = 152,787,090.51/12,998.67
6. Step 6: Final answer
   x = 11,754.06