Finding the Fourth Proportional to 1,858.79, 2,565.24 and 1,228.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.79 : 2,565.24 = 1,228.21 : x
2. Step 2: Convert to fraction form
   1,858.79/2,565.24 = 1,228.21/x
3. Step 3: Cross multiply
   1,858.79x = 2,565.24 × 1,228.21
4. Step 4: Simplify right side
   1,858.79x = 3,150,647.01
5. Step 5: Solve for x
   x = 3,150,647.01/1,858.79
6. Step 6: Final answer
   x = 1,695.00