Finding the Fourth Proportional to 1,249.83, 1,872.72 and 761.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,249.83 : 1,872.72 = 761.40 : x
2. Step 2: Convert to fraction form
   1,249.83/1,872.72 = 761.40/x
3. Step 3: Cross multiply
   1,249.83x = 1,872.72 × 761.40
4. Step 4: Simplify right side
   1,249.83x = 1,425,889.01
5. Step 5: Solve for x
   x = 1,425,889.01/1,249.83
6. Step 6: Final answer
   x = 1,140.87