Finding the Fourth Proportional to 12,820.57, 17,690.05 and 9,748.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.57 : 17,690.05 = 9,748.18 : x
2. Step 2: Convert to fraction form
   12,820.57/17,690.05 = 9,748.18/x
3. Step 3: Cross multiply
   12,820.57x = 17,690.05 × 9,748.18
4. Step 4: Simplify right side
   12,820.57x = 172,445,791.61
5. Step 5: Solve for x
   x = 172,445,791.61/12,820.57
6. Step 6: Final answer
   x = 13,450.71