Finding the Fourth Proportional to 9,419.57, 12,998.99 and 5,440.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,419.57 : 12,998.99 = 5,440.58 : x
2. Step 2: Convert to fraction form
   9,419.57/12,998.99 = 5,440.58/x
3. Step 3: Cross multiply
   9,419.57x = 12,998.99 × 5,440.58
4. Step 4: Simplify right side
   9,419.57x = 70,722,017.81
5. Step 5: Solve for x
   x = 70,722,017.81/9,419.57
6. Step 6: Final answer
   x = 7,507.99