Finding the Fourth Proportional to 2,603.86, 3,905.72 and 959.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603.86 : 3,905.72 = 959.74 : x
2. Step 2: Convert to fraction form
   2,603.86/3,905.72 = 959.74/x
3. Step 3: Cross multiply
   2,603.86x = 3,905.72 × 959.74
4. Step 4: Simplify right side
   2,603.86x = 3,748,475.71
5. Step 5: Solve for x
   x = 3,748,475.71/2,603.86
6. Step 6: Final answer
   x = 1,439.58