Finding the Fourth Proportional to 2,507.09, 3,459.81 and 1,388.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.09 : 3,459.81 = 1,388.05 : x
2. Step 2: Convert to fraction form
   2,507.09/3,459.81 = 1,388.05/x
3. Step 3: Cross multiply
   2,507.09x = 3,459.81 × 1,388.05
4. Step 4: Simplify right side
   2,507.09x = 4,802,382.88
5. Step 5: Solve for x
   x = 4,802,382.88/2,507.09
6. Step 6: Final answer
   x = 1,915.52