Finding the Fourth Proportional to 1,859.32, 2,787.58 and 1,128.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.32 : 2,787.58 = 1,128.72 : x
2. Step 2: Convert to fraction form
   1,859.32/2,787.58 = 1,128.72/x
3. Step 3: Cross multiply
   1,859.32x = 2,787.58 × 1,128.72
4. Step 4: Simplify right side
   1,859.32x = 3,146,397.30
5. Step 5: Solve for x
   x = 3,146,397.30/1,859.32
6. Step 6: Final answer
   x = 1,692.23