Finding the Fourth Proportional to 1,369.47, 1,890.01 and 810.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.47 : 1,890.01 = 810.12 : x
2. Step 2: Convert to fraction form
   1,369.47/1,890.01 = 810.12/x
3. Step 3: Cross multiply
   1,369.47x = 1,890.01 × 810.12
4. Step 4: Simplify right side
   1,369.47x = 1,531,134.90
5. Step 5: Solve for x
   x = 1,531,134.90/1,369.47
6. Step 6: Final answer
   x = 1,118.05