Finding the Fourth Proportional to 2,052.30, 2,828.61 and 1,388.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,052.30 : 2,828.61 = 1,388.91 : x
2. Step 2: Convert to fraction form
   2,052.30/2,828.61 = 1,388.91/x
3. Step 3: Cross multiply
   2,052.30x = 2,828.61 × 1,388.91
4. Step 4: Simplify right side
   2,052.30x = 3,928,684.72
5. Step 5: Solve for x
   x = 3,928,684.72/2,052.30
6. Step 6: Final answer
   x = 1,914.28