Finding the Fourth Proportional to 13,978.72, 19,289.80 and 7,605.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.72 : 19,289.80 = 7,605.28 : x
2. Step 2: Convert to fraction form
   13,978.72/19,289.80 = 7,605.28/x
3. Step 3: Cross multiply
   13,978.72x = 19,289.80 × 7,605.28
4. Step 4: Simplify right side
   13,978.72x = 146,704,330.14
5. Step 5: Solve for x
   x = 146,704,330.14/13,978.72
6. Step 6: Final answer
   x = 10,494.83