Finding the Fourth Proportional to 12,840.47, 17,719.29 and 8,062.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,840.47 : 17,719.29 = 8,062.89 : x
2. Step 2: Convert to fraction form
   12,840.47/17,719.29 = 8,062.89/x
3. Step 3: Cross multiply
   12,840.47x = 17,719.29 × 8,062.89
4. Step 4: Simplify right side
   12,840.47x = 142,868,686.15
5. Step 5: Solve for x
   x = 142,868,686.15/12,840.47
6. Step 6: Final answer
   x = 11,126.44