Finding the Fourth Proportional to 1,805.90, 2,705.72 and 880.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,805.90 : 2,705.72 = 880.25 : x
2. Step 2: Convert to fraction form
   1,805.90/2,705.72 = 880.25/x
3. Step 3: Cross multiply
   1,805.90x = 2,705.72 × 880.25
4. Step 4: Simplify right side
   1,805.90x = 2,381,692.10
5. Step 5: Solve for x
   x = 2,381,692.10/1,805.90
6. Step 6: Final answer
   x = 1,318.84