Finding the Fourth Proportional to 2,002.79, 3,005.21 and 906.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,002.79 : 3,005.21 = 906.55 : x
2. Step 2: Convert to fraction form
   2,002.79/3,005.21 = 906.55/x
3. Step 3: Cross multiply
   2,002.79x = 3,005.21 × 906.55
4. Step 4: Simplify right side
   2,002.79x = 2,724,373.13
5. Step 5: Solve for x
   x = 2,724,373.13/2,002.79
6. Step 6: Final answer
   x = 1,360.29