Finding the Fourth Proportional to 12,918.90, 17,827.89 and 7,329.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,918.90 : 17,827.89 = 7,329.78 : x
2. Step 2: Convert to fraction form
   12,918.90/17,827.89 = 7,329.78/x
3. Step 3: Cross multiply
   12,918.90x = 17,827.89 × 7,329.78
4. Step 4: Simplify right side
   12,918.90x = 130,674,511.56
5. Step 5: Solve for x
   x = 130,674,511.56/12,918.90
6. Step 6: Final answer
   x = 10,114.99