Finding the Fourth Proportional to 11,401.78, 17,109.16 and 9,107.86

Step by Step Solution

1. Step 1: Write the proportion equation
   11,401.78 : 17,109.16 = 9,107.86 : x
2. Step 2: Convert to fraction form
   11,401.78/17,109.16 = 9,107.86/x
3. Step 3: Cross multiply
   11,401.78x = 17,109.16 × 9,107.86
4. Step 4: Simplify right side
   11,401.78x = 155,827,834.00
5. Step 5: Solve for x
   x = 155,827,834.00/11,401.78
6. Step 6: Final answer
   x = 13,666.97