Finding the Fourth Proportional to 1,398.69, 1,929.29 and 873.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.69 : 1,929.29 = 873.81 : x
2. Step 2: Convert to fraction form
   1,398.69/1,929.29 = 873.81/x
3. Step 3: Cross multiply
   1,398.69x = 1,929.29 × 873.81
4. Step 4: Simplify right side
   1,398.69x = 1,685,828.53
5. Step 5: Solve for x
   x = 1,685,828.53/1,398.69
6. Step 6: Final answer
   x = 1,205.29