Finding the Fourth Proportional to 2,505.87, 3,458.05 and 1,386.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.87 : 3,458.05 = 1,386.86 : x
2. Step 2: Convert to fraction form
   2,505.87/3,458.05 = 1,386.86/x
3. Step 3: Cross multiply
   2,505.87x = 3,458.05 × 1,386.86
4. Step 4: Simplify right side
   2,505.87x = 4,795,810.47
5. Step 5: Solve for x
   x = 4,795,810.47/2,505.87
6. Step 6: Final answer
   x = 1,913.83