Finding the Fourth Proportional to 2,331.76, 3,495.81 and 870.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,331.76 : 3,495.81 = 870.12 : x
2. Step 2: Convert to fraction form
   2,331.76/3,495.81 = 870.12/x
3. Step 3: Cross multiply
   2,331.76x = 3,495.81 × 870.12
4. Step 4: Simplify right side
   2,331.76x = 3,041,774.20
5. Step 5: Solve for x
   x = 3,041,774.20/2,331.76
6. Step 6: Final answer
   x = 1,304.50