Finding the Fourth Proportional to 2,101.88, 3,151.10 and 870.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.88 : 3,151.10 = 870.18 : x
2. Step 2: Convert to fraction form
   2,101.88/3,151.10 = 870.18/x
3. Step 3: Cross multiply
   2,101.88x = 3,151.10 × 870.18
4. Step 4: Simplify right side
   2,101.88x = 2,742,014.56
5. Step 5: Solve for x
   x = 2,742,014.56/2,101.88
6. Step 6: Final answer
   x = 1,304.55