Finding the Fourth Proportional to 1,311.47, 1,808.34 and 1,012.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311.47 : 1,808.34 = 1,012.04 : x
2. Step 2: Convert to fraction form
   1,311.47/1,808.34 = 1,012.04/x
3. Step 3: Cross multiply
   1,311.47x = 1,808.34 × 1,012.04
4. Step 4: Simplify right side
   1,311.47x = 1,830,103.37
5. Step 5: Solve for x
   x = 1,830,103.37/1,311.47
6. Step 6: Final answer
   x = 1,395.46