Finding the Fourth Proportional to 1,563.81, 2,343.89 and 870.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.81 : 2,343.89 = 870.15 : x
2. Step 2: Convert to fraction form
   1,563.81/2,343.89 = 870.15/x
3. Step 3: Cross multiply
   1,563.81x = 2,343.89 × 870.15
4. Step 4: Simplify right side
   1,563.81x = 2,039,535.88
5. Step 5: Solve for x
   x = 2,039,535.88/1,563.81
6. Step 6: Final answer
   x = 1,304.21