Finding the Fourth Proportional to 2,505.79, 3,457.91 and 1,386.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.79 : 3,457.91 = 1,386.78 : x
2. Step 2: Convert to fraction form
   2,505.79/3,457.91 = 1,386.78/x
3. Step 3: Cross multiply
   2,505.79x = 3,457.91 × 1,386.78
4. Step 4: Simplify right side
   2,505.79x = 4,795,348.32
5. Step 5: Solve for x
   x = 4,795,348.32/2,505.79
6. Step 6: Final answer
   x = 1,913.71