Finding the Fourth Proportional to 2,805.72, 4,209.05 and 1,051.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.72 : 4,209.05 = 1,051.35 : x
2. Step 2: Convert to fraction form
   2,805.72/4,209.05 = 1,051.35/x
3. Step 3: Cross multiply
   2,805.72x = 4,209.05 × 1,051.35
4. Step 4: Simplify right side
   2,805.72x = 4,425,179.46
5. Step 5: Solve for x
   x = 4,425,179.46/2,805.72
6. Step 6: Final answer
   x = 1,577.20