Finding the Fourth Proportional to 12,801.94, 17,666.16 and 7,136.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,801.94 : 17,666.16 = 7,136.40 : x
2. Step 2: Convert to fraction form
   12,801.94/17,666.16 = 7,136.40/x
3. Step 3: Cross multiply
   12,801.94x = 17,666.16 × 7,136.40
4. Step 4: Simplify right side
   12,801.94x = 126,072,784.22
5. Step 5: Solve for x
   x = 126,072,784.22/12,801.94
6. Step 6: Final answer
   x = 9,847.94