Finding the Fourth Proportional to 2,071.65, 2,858.72 and 1,285.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.65 : 2,858.72 = 1,285.55 : x
2. Step 2: Convert to fraction form
   2,071.65/2,858.72 = 1,285.55/x
3. Step 3: Cross multiply
   2,071.65x = 2,858.72 × 1,285.55
4. Step 4: Simplify right side
   2,071.65x = 3,675,006.77
5. Step 5: Solve for x
   x = 3,675,006.77/2,071.65
6. Step 6: Final answer
   x = 1,773.95