Finding the Fourth Proportional to 2,507.72, 3,460.55 and 1,388.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.72 : 3,460.55 = 1,388.66 : x
2. Step 2: Convert to fraction form
   2,507.72/3,460.55 = 1,388.66/x
3. Step 3: Cross multiply
   2,507.72x = 3,460.55 × 1,388.66
4. Step 4: Simplify right side
   2,507.72x = 4,805,503.12
5. Step 5: Solve for x
   x = 4,805,503.12/2,507.72
6. Step 6: Final answer
   x = 1,916.29