Finding the Fourth Proportional to 2,507.40, 3,460.05 and 1,388.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.40 : 3,460.05 = 1,388.25 : x
2. Step 2: Convert to fraction form
   2,507.40/3,460.05 = 1,388.25/x
3. Step 3: Cross multiply
   2,507.40x = 3,460.05 × 1,388.25
4. Step 4: Simplify right side
   2,507.40x = 4,803,414.41
5. Step 5: Solve for x
   x = 4,803,414.41/2,507.40
6. Step 6: Final answer
   x = 1,915.70