Finding the Fourth Proportional to 1,921.34, 2,874.71 and 1,189.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.34 : 2,874.71 = 1,189.10 : x
2. Step 2: Convert to fraction form
   1,921.34/2,874.71 = 1,189.10/x
3. Step 3: Cross multiply
   1,921.34x = 2,874.71 × 1,189.10
4. Step 4: Simplify right side
   1,921.34x = 3,418,317.66
5. Step 5: Solve for x
   x = 3,418,317.66/1,921.34
6. Step 6: Final answer
   x = 1,779.13