Finding the Fourth Proportional to 9,412.96, 12,989.76 and 5,379.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,412.96 : 12,989.76 = 5,379.74 : x
2. Step 2: Convert to fraction form
   9,412.96/12,989.76 = 5,379.74/x
3. Step 3: Cross multiply
   9,412.96x = 12,989.76 × 5,379.74
4. Step 4: Simplify right side
   9,412.96x = 69,881,577.39
5. Step 5: Solve for x
   x = 69,881,577.39/9,412.96
6. Step 6: Final answer
   x = 7,423.97