Finding the Fourth Proportional to 2,507.76, 3,460.55 and 1,388.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.76 : 3,460.55 = 1,388.61 : x
2. Step 2: Convert to fraction form
   2,507.76/3,460.55 = 1,388.61/x
3. Step 3: Cross multiply
   2,507.76x = 3,460.55 × 1,388.61
4. Step 4: Simplify right side
   2,507.76x = 4,805,347.39
5. Step 5: Solve for x
   x = 4,805,347.39/2,507.76
6. Step 6: Final answer
   x = 1,916.19