Finding the Fourth Proportional to 3,139.98, 4,328.55 and 2,475.51

Step by Step Solution

1. Step 1: Write the proportion equation
   3,139.98 : 4,328.55 = 2,475.51 : x
2. Step 2: Convert to fraction form
   3,139.98/4,328.55 = 2,475.51/x
3. Step 3: Cross multiply
   3,139.98x = 4,328.55 × 2,475.51
4. Step 4: Simplify right side
   3,139.98x = 10,715,368.81
5. Step 5: Solve for x
   x = 10,715,368.81/3,139.98
6. Step 6: Final answer
   x = 3,412.56