Finding the Fourth Proportional to 13,978.11, 19,289.55 and 7,604.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.11 : 19,289.55 = 7,604.79 : x
2. Step 2: Convert to fraction form
   13,978.11/19,289.55 = 7,604.79/x
3. Step 3: Cross multiply
   13,978.11x = 19,289.55 × 7,604.79
4. Step 4: Simplify right side
   13,978.11x = 146,692,976.94
5. Step 5: Solve for x
   x = 146,692,976.94/13,978.11
6. Step 6: Final answer
   x = 10,494.48