Finding the Fourth Proportional to 2,603.58, 3,905.64 and 872.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.58 : 3,905.64 = 872.34 : x
2. Step 2: Convert to fraction form
   2,603.58/3,905.64 = 872.34/x
3. Step 3: Cross multiply
   2,603.58x = 3,905.64 × 872.34
4. Step 4: Simplify right side
   2,603.58x = 3,407,046.00
5. Step 5: Solve for x
   x = 3,407,046.00/2,603.58
6. Step 6: Final answer
   x = 1,308.60