Finding the Fourth Proportional to 12,549.42, 18,807.72 and 5,145.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,549.42 : 18,807.72 = 5,145.22 : x
2. Step 2: Convert to fraction form
   12,549.42/18,807.72 = 5,145.22/x
3. Step 3: Cross multiply
   12,549.42x = 18,807.72 × 5,145.22
4. Step 4: Simplify right side
   12,549.42x = 96,769,857.10
5. Step 5: Solve for x
   x = 96,769,857.10/12,549.42
6. Step 6: Final answer
   x = 7,711.10