Finding the Fourth Proportional to 2,506.82, 3,459.60 and 1,388.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,506.82 : 3,459.60 = 1,388.12 : x
2. Step 2: Convert to fraction form
   2,506.82/3,459.60 = 1,388.12/x
3. Step 3: Cross multiply
   2,506.82x = 3,459.60 × 1,388.12
4. Step 4: Simplify right side
   2,506.82x = 4,802,322.65
5. Step 5: Solve for x
   x = 4,802,322.65/2,506.82
6. Step 6: Final answer
   x = 1,915.71