Finding the Fourth Proportional to 12,672.79, 19,012.43 and 5,274.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,672.79 : 19,012.43 = 5,274.79 : x
2. Step 2: Convert to fraction form
   12,672.79/19,012.43 = 5,274.79/x
3. Step 3: Cross multiply
   12,672.79x = 19,012.43 × 5,274.79
4. Step 4: Simplify right side
   12,672.79x = 100,286,549.27
5. Step 5: Solve for x
   x = 100,286,549.27/12,672.79
6. Step 6: Final answer
   x = 7,913.53