Finding the Fourth Proportional to 2,104.21, 3,156.23 and 870.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.21 : 3,156.23 = 870.69 : x
2. Step 2: Convert to fraction form
   2,104.21/3,156.23 = 870.69/x
3. Step 3: Cross multiply
   2,104.21x = 3,156.23 × 870.69
4. Step 4: Simplify right side
   2,104.21x = 2,748,100.08
5. Step 5: Solve for x
   x = 2,748,100.08/2,104.21
6. Step 6: Final answer
   x = 1,306.00