Finding the Fourth Proportional to 9,419.34, 12,999.84 and 5,440.45

Step by Step Solution

1. Step 1: Write the proportion equation
   9,419.34 : 12,999.84 = 5,440.45 : x
2. Step 2: Convert to fraction form
   9,419.34/12,999.84 = 5,440.45/x
3. Step 3: Cross multiply
   9,419.34x = 12,999.84 × 5,440.45
4. Step 4: Simplify right side
   9,419.34x = 70,724,947.03
5. Step 5: Solve for x
   x = 70,724,947.03/9,419.34
6. Step 6: Final answer
   x = 7,508.48