Finding the Fourth Proportional to 19,139.56, 28,713.92 and 9,267.30

Step by Step Solution

1. Step 1: Write the proportion equation
   19,139.56 : 28,713.92 = 9,267.30 : x
2. Step 2: Convert to fraction form
   19,139.56/28,713.92 = 9,267.30/x
3. Step 3: Cross multiply
   19,139.56x = 28,713.92 × 9,267.30
4. Step 4: Simplify right side
   19,139.56x = 266,100,510.82
5. Step 5: Solve for x
   x = 266,100,510.82/19,139.56
6. Step 6: Final answer
   x = 13,903.17