Finding the Fourth Proportional to 12,819.96, 17,686.62 and 9,470.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.96 : 17,686.62 = 9,470.79 : x
2. Step 2: Convert to fraction form
   12,819.96/17,686.62 = 9,470.79/x
3. Step 3: Cross multiply
   12,819.96x = 17,686.62 × 9,470.79
4. Step 4: Simplify right side
   12,819.96x = 167,506,263.83
5. Step 5: Solve for x
   x = 167,506,263.83/12,819.96
6. Step 6: Final answer
   x = 13,066.05