Finding the Fourth Proportional to 2,507.31, 3,459.80 and 1,388.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.31 : 3,459.80 = 1,388.10 : x
2. Step 2: Convert to fraction form
   2,507.31/3,459.80 = 1,388.10/x
3. Step 3: Cross multiply
   2,507.31x = 3,459.80 × 1,388.10
4. Step 4: Simplify right side
   2,507.31x = 4,802,548.38
5. Step 5: Solve for x
   x = 4,802,548.38/2,507.31
6. Step 6: Final answer
   x = 1,915.42