Finding the Fourth Proportional to 1,369.84, 1,890.52 and 810.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.84 : 1,890.52 = 810.50 : x
2. Step 2: Convert to fraction form
   1,369.84/1,890.52 = 810.50/x
3. Step 3: Cross multiply
   1,369.84x = 1,890.52 × 810.50
4. Step 4: Simplify right side
   1,369.84x = 1,532,266.46
5. Step 5: Solve for x
   x = 1,532,266.46/1,369.84
6. Step 6: Final answer
   x = 1,118.57