Finding the Fourth Proportional to 1,815.58, 2,505.63 and 1,284.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.58 : 2,505.63 = 1,284.63 : x
2. Step 2: Convert to fraction form
   1,815.58/2,505.63 = 1,284.63/x
3. Step 3: Cross multiply
   1,815.58x = 2,505.63 × 1,284.63
4. Step 4: Simplify right side
   1,815.58x = 3,218,802.89
5. Step 5: Solve for x
   x = 3,218,802.89/1,815.58
6. Step 6: Final answer
   x = 1,772.88