Finding the Fourth Proportional to 12,900.63, 17,803.59 and 9,708.19

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.63 : 17,803.59 = 9,708.19 : x
2. Step 2: Convert to fraction form
   12,900.63/17,803.59 = 9,708.19/x
3. Step 3: Cross multiply
   12,900.63x = 17,803.59 × 9,708.19
4. Step 4: Simplify right side
   12,900.63x = 172,840,634.40
5. Step 5: Solve for x
   x = 172,840,634.40/12,900.63
6. Step 6: Final answer
   x = 13,397.84