Finding the Fourth Proportional to 1,808.78, 2,495.85 and 1,012.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,808.78 : 2,495.85 = 1,012.07 : x
2. Step 2: Convert to fraction form
   1,808.78/2,495.85 = 1,012.07/x
3. Step 3: Cross multiply
   1,808.78x = 2,495.85 × 1,012.07
4. Step 4: Simplify right side
   1,808.78x = 2,525,962.43
5. Step 5: Solve for x
   x = 2,525,962.43/1,808.78
6. Step 6: Final answer
   x = 1,396.50