Finding the Fourth Proportional to 12,820.45, 17,684.58 and 9,471.91

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.45 : 17,684.58 = 9,471.91 : x
2. Step 2: Convert to fraction form
   12,820.45/17,684.58 = 9,471.91/x
3. Step 3: Cross multiply
   12,820.45x = 17,684.58 × 9,471.91
4. Step 4: Simplify right side
   12,820.45x = 167,506,750.15
5. Step 5: Solve for x
   x = 167,506,750.15/12,820.45
6. Step 6: Final answer
   x = 13,065.59