Finding the Fourth Proportional to 10,019.35, 13,788.52 and 9,406.99

Step by Step Solution

1. Step 1: Write the proportion equation
   10,019.35 : 13,788.52 = 9,406.99 : x
2. Step 2: Convert to fraction form
   10,019.35/13,788.52 = 9,406.99/x
3. Step 3: Cross multiply
   10,019.35x = 13,788.52 × 9,406.99
4. Step 4: Simplify right side
   10,019.35x = 129,708,469.75
5. Step 5: Solve for x
   x = 129,708,469.75/10,019.35
6. Step 6: Final answer
   x = 12,945.80