Finding the Fourth Proportional to 2,507.99, 3,461.15 and 1,389.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,507.99 : 3,461.15 = 1,389.05 : x
2. Step 2: Convert to fraction form
   2,507.99/3,461.15 = 1,389.05/x
3. Step 3: Cross multiply
   2,507.99x = 3,461.15 × 1,389.05
4. Step 4: Simplify right side
   2,507.99x = 4,807,686.16
5. Step 5: Solve for x
   x = 4,807,686.16/2,507.99
6. Step 6: Final answer
   x = 1,916.95