Finding the Fourth Proportional to 1,858.56, 2,563.47 and 1,578.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.56 : 2,563.47 = 1,578.35 : x
2. Step 2: Convert to fraction form
   1,858.56/2,563.47 = 1,578.35/x
3. Step 3: Cross multiply
   1,858.56x = 2,563.47 × 1,578.35
4. Step 4: Simplify right side
   1,858.56x = 4,046,059.28
5. Step 5: Solve for x
   x = 4,046,059.28/1,858.56
6. Step 6: Final answer
   x = 2,176.99