Finding the Fourth Proportional to 1,686.55, 2,525.91 and 1,628.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,686.55 : 2,525.91 = 1,628.15 : x
2. Step 2: Convert to fraction form
   1,686.55/2,525.91 = 1,628.15/x
3. Step 3: Cross multiply
   1,686.55x = 2,525.91 × 1,628.15
4. Step 4: Simplify right side
   1,686.55x = 4,112,560.37
5. Step 5: Solve for x
   x = 4,112,560.37/1,686.55
6. Step 6: Final answer
   x = 2,438.45