Finding the Fourth Proportional to 1,382.72, 1,908.24 and 761.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.72 : 1,908.24 = 761.72 : x
2. Step 2: Convert to fraction form
   1,382.72/1,908.24 = 761.72/x
3. Step 3: Cross multiply
   1,382.72x = 1,908.24 × 761.72
4. Step 4: Simplify right side
   1,382.72x = 1,453,544.57
5. Step 5: Solve for x
   x = 1,453,544.57/1,382.72
6. Step 6: Final answer
   x = 1,051.22