Finding the Fourth Proportional to 1,380.42, 1,904.76 and 1,101.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,380.42 : 1,904.76 = 1,101.42 : x
2. Step 2: Convert to fraction form
   1,380.42/1,904.76 = 1,101.42/x
3. Step 3: Cross multiply
   1,380.42x = 1,904.76 × 1,101.42
4. Step 4: Simplify right side
   1,380.42x = 2,097,940.76
5. Step 5: Solve for x
   x = 2,097,940.76/1,380.42
6. Step 6: Final answer
   x = 1,519.78