Finding the Fourth Proportional to 2,507.89, 3,460.92 and 1,388.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.89 : 3,460.92 = 1,388.89 : x
2. Step 2: Convert to fraction form
   2,507.89/3,460.92 = 1,388.89/x
3. Step 3: Cross multiply
   2,507.89x = 3,460.92 × 1,388.89
4. Step 4: Simplify right side
   2,507.89x = 4,806,830.23
5. Step 5: Solve for x
   x = 4,806,830.23/2,507.89
6. Step 6: Final answer
   x = 1,916.68