Finding the Fourth Proportional to 9,404.84, 12,978.90 and 5,426.19

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.84 : 12,978.90 = 5,426.19 : x
2. Step 2: Convert to fraction form
   9,404.84/12,978.90 = 5,426.19/x
3. Step 3: Cross multiply
   9,404.84x = 12,978.90 × 5,426.19
4. Step 4: Simplify right side
   9,404.84x = 70,425,977.39
5. Step 5: Solve for x
   x = 70,425,977.39/9,404.84
6. Step 6: Final answer
   x = 7,488.27