Finding the Fourth Proportional to 1,603.76, 2,406.38 and 872.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.76 : 2,406.38 = 872.46 : x
2. Step 2: Convert to fraction form
   1,603.76/2,406.38 = 872.46/x
3. Step 3: Cross multiply
   1,603.76x = 2,406.38 × 872.46
4. Step 4: Simplify right side
   1,603.76x = 2,099,465.93
5. Step 5: Solve for x
   x = 2,099,465.93/1,603.76
6. Step 6: Final answer
   x = 1,309.09