Finding the Fourth Proportional to 1,355.81, 1,870.20 and 1,025.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.81 : 1,870.20 = 1,025.51 : x
2. Step 2: Convert to fraction form
   1,355.81/1,870.20 = 1,025.51/x
3. Step 3: Cross multiply
   1,355.81x = 1,870.20 × 1,025.51
4. Step 4: Simplify right side
   1,355.81x = 1,917,899.45
5. Step 5: Solve for x
   x = 1,917,899.45/1,355.81
6. Step 6: Final answer
   x = 1,414.58