Finding the Fourth Proportional to 1,899.86, 2,621.73 and 1,103.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.86 : 2,621.73 = 1,103.20 : x
2. Step 2: Convert to fraction form
   1,899.86/2,621.73 = 1,103.20/x
3. Step 3: Cross multiply
   1,899.86x = 2,621.73 × 1,103.20
4. Step 4: Simplify right side
   1,899.86x = 2,892,292.54
5. Step 5: Solve for x
   x = 2,892,292.54/1,899.86
6. Step 6: Final answer
   x = 1,522.37