Finding the Fourth Proportional to 1,355.13, 1,869.55 and 883.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.13 : 1,869.55 = 883.58 : x
2. Step 2: Convert to fraction form
   1,355.13/1,869.55 = 883.58/x
3. Step 3: Cross multiply
   1,355.13x = 1,869.55 × 883.58
4. Step 4: Simplify right side
   1,355.13x = 1,651,885.43
5. Step 5: Solve for x
   x = 1,651,885.43/1,355.13
6. Step 6: Final answer
   x = 1,218.99