Finding the Fourth Proportional to 14,359.28, 19,810.78 and 8,390.59

Step by Step Solution

1. Step 1: Write the proportion equation
   14,359.28 : 19,810.78 = 8,390.59 : x
2. Step 2: Convert to fraction form
   14,359.28/19,810.78 = 8,390.59/x
3. Step 3: Cross multiply
   14,359.28x = 19,810.78 × 8,390.59
4. Step 4: Simplify right side
   14,359.28x = 166,224,062.06
5. Step 5: Solve for x
   x = 166,224,062.06/14,359.28
6. Step 6: Final answer
   x = 11,576.08