Finding the Fourth Proportional to 7,090.64, 10,629.38 and 3,139.79

Step by Step Solution

1. Step 1: Write the proportion equation
   7,090.64 : 10,629.38 = 3,139.79 : x
2. Step 2: Convert to fraction form
   7,090.64/10,629.38 = 3,139.79/x
3. Step 3: Cross multiply
   7,090.64x = 10,629.38 × 3,139.79
4. Step 4: Simplify right side
   7,090.64x = 33,374,003.82
5. Step 5: Solve for x
   x = 33,374,003.82/7,090.64
6. Step 6: Final answer
   x = 4,706.77