Finding the Fourth Proportional to 13,406.38, 18,498.72 and 7,663.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,406.38 : 18,498.72 = 7,663.75 : x
2. Step 2: Convert to fraction form
   13,406.38/18,498.72 = 7,663.75/x
3. Step 3: Cross multiply
   13,406.38x = 18,498.72 × 7,663.75
4. Step 4: Simplify right side
   13,406.38x = 141,769,565.40
5. Step 5: Solve for x
   x = 141,769,565.40/13,406.38
6. Step 6: Final answer
   x = 10,574.78