Finding the Fourth Proportional to 2,124.68, 3,185.78 and 1,259.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,124.68 : 3,185.78 = 1,259.60 : x
2. Step 2: Convert to fraction form
   2,124.68/3,185.78 = 1,259.60/x
3. Step 3: Cross multiply
   2,124.68x = 3,185.78 × 1,259.60
4. Step 4: Simplify right side
   2,124.68x = 4,012,808.49
5. Step 5: Solve for x
   x = 4,012,808.49/2,124.68
6. Step 6: Final answer
   x = 1,888.66