Finding the Fourth Proportional to 14,218.56, 19,621.71 and 7,931.34

Step by Step Solution

1. Step 1: Write the proportion equation
   14,218.56 : 19,621.71 = 7,931.34 : x
2. Step 2: Convert to fraction form
   14,218.56/19,621.71 = 7,931.34/x
3. Step 3: Cross multiply
   14,218.56x = 19,621.71 × 7,931.34
4. Step 4: Simplify right side
   14,218.56x = 155,626,453.39
5. Step 5: Solve for x
   x = 155,626,453.39/14,218.56
6. Step 6: Final answer
   x = 10,945.30