Finding the Fourth Proportional to 9,403.72, 12,975.16 and 5,423.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,403.72 : 12,975.16 = 5,423.80 : x
2. Step 2: Convert to fraction form
   9,403.72/12,975.16 = 5,423.80/x
3. Step 3: Cross multiply
   9,403.72x = 12,975.16 × 5,423.80
4. Step 4: Simplify right side
   9,403.72x = 70,374,672.81
5. Step 5: Solve for x
   x = 70,374,672.81/9,403.72
6. Step 6: Final answer
   x = 7,483.71