Finding the Fourth Proportional to 1,380.55, 1,904.28 and 883.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.55 : 1,904.28 = 883.01 : x
2. Step 2: Convert to fraction form
   1,380.55/1,904.28 = 883.01/x
3. Step 3: Cross multiply
   1,380.55x = 1,904.28 × 883.01
4. Step 4: Simplify right side
   1,380.55x = 1,681,498.28
5. Step 5: Solve for x
   x = 1,681,498.28/1,380.55
6. Step 6: Final answer
   x = 1,217.99