Finding the Fourth Proportional to 9,298.80, 12,798.96 and 8,412.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,298.80 : 12,798.96 = 8,412.72 : x
2. Step 2: Convert to fraction form
   9,298.80/12,798.96 = 8,412.72/x
3. Step 3: Cross multiply
   9,298.80x = 12,798.96 × 8,412.72
4. Step 4: Simplify right side
   9,298.80x = 107,674,066.77
5. Step 5: Solve for x
   x = 107,674,066.77/9,298.80
6. Step 6: Final answer
   x = 11,579.35