Finding the Fourth Proportional to 1,858.16, 2,565.32 and 1,228.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.16 : 2,565.32 = 1,228.50 : x
2. Step 2: Convert to fraction form
   1,858.16/2,565.32 = 1,228.50/x
3. Step 3: Cross multiply
   1,858.16x = 2,565.32 × 1,228.50
4. Step 4: Simplify right side
   1,858.16x = 3,151,489.48
5. Step 5: Solve for x
   x = 3,151,489.48/1,858.16
6. Step 6: Final answer
   x = 1,696.02