Finding the Fourth Proportional to 2,602.06, 3,903.30 and 870.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,602.06 : 3,903.30 = 870.69 : x
2. Step 2: Convert to fraction form
   2,602.06/3,903.30 = 870.69/x
3. Step 3: Cross multiply
   2,602.06x = 3,903.30 × 870.69
4. Step 4: Simplify right side
   2,602.06x = 3,398,564.28
5. Step 5: Solve for x
   x = 3,398,564.28/2,602.06
6. Step 6: Final answer
   x = 1,306.11