Finding the Fourth Proportional to 9,406.53, 12,979.65 and 5,426.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.53 : 12,979.65 = 5,426.91 : x
2. Step 2: Convert to fraction form
   9,406.53/12,979.65 = 5,426.91/x
3. Step 3: Cross multiply
   9,406.53x = 12,979.65 × 5,426.91
4. Step 4: Simplify right side
   9,406.53x = 70,439,392.38
5. Step 5: Solve for x
   x = 70,439,392.38/9,406.53
6. Step 6: Final answer
   x = 7,488.35