Finding the Fourth Proportional to 2,507.09, 3,459.90 and 1,388.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.09 : 3,459.90 = 1,388.03 : x
2. Step 2: Convert to fraction form
   2,507.09/3,459.90 = 1,388.03/x
3. Step 3: Cross multiply
   2,507.09x = 3,459.90 × 1,388.03
4. Step 4: Simplify right side
   2,507.09x = 4,802,445.00
5. Step 5: Solve for x
   x = 4,802,445.00/2,507.09
6. Step 6: Final answer
   x = 1,915.55