Finding the Fourth Proportional to 12,300.05, 18,446.74 and 5,279.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,300.05 : 18,446.74 = 5,279.78 : x
2. Step 2: Convert to fraction form
   12,300.05/18,446.74 = 5,279.78/x
3. Step 3: Cross multiply
   12,300.05x = 18,446.74 × 5,279.78
4. Step 4: Simplify right side
   12,300.05x = 97,394,761.83
5. Step 5: Solve for x
   x = 97,394,761.83/12,300.05
6. Step 6: Final answer
   x = 7,918.24