Finding the Fourth Proportional to 12,729.82, 19,090.18 and 4,407.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,729.82 : 19,090.18 = 4,407.60 : x
2. Step 2: Convert to fraction form
   12,729.82/19,090.18 = 4,407.60/x
3. Step 3: Cross multiply
   12,729.82x = 19,090.18 × 4,407.60
4. Step 4: Simplify right side
   12,729.82x = 84,141,935.87
5. Step 5: Solve for x
   x = 84,141,935.87/12,729.82
6. Step 6: Final answer
   x = 6,609.83