Finding the Fourth Proportional to 19,107.10, 28,667.34 and 7,428.52

Step by Step Solution

1. Step 1: Write the proportion equation
   19,107.10 : 28,667.34 = 7,428.52 : x
2. Step 2: Convert to fraction form
   19,107.10/28,667.34 = 7,428.52/x
3. Step 3: Cross multiply
   19,107.10x = 28,667.34 × 7,428.52
4. Step 4: Simplify right side
   19,107.10x = 212,955,908.54
5. Step 5: Solve for x
   x = 212,955,908.54/19,107.10
6. Step 6: Final answer
   x = 11,145.38