Finding the Fourth Proportional to 2,507.15, 3,459.59 and 1,388.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.15 : 3,459.59 = 1,388.00 : x
2. Step 2: Convert to fraction form
   2,507.15/3,459.59 = 1,388.00/x
3. Step 3: Cross multiply
   2,507.15x = 3,459.59 × 1,388.00
4. Step 4: Simplify right side
   2,507.15x = 4,801,899.34
5. Step 5: Solve for x
   x = 4,801,899.34/2,507.15
6. Step 6: Final answer
   x = 1,915.28