Finding the Fourth Proportional to 1,533.72, 2,116.50 and 870.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.72 : 2,116.50 = 870.56 : x
2. Step 2: Convert to fraction form
   1,533.72/2,116.50 = 870.56/x
3. Step 3: Cross multiply
   1,533.72x = 2,116.50 × 870.56
4. Step 4: Simplify right side
   1,533.72x = 1,842,540.24
5. Step 5: Solve for x
   x = 1,842,540.24/1,533.72
6. Step 6: Final answer
   x = 1,201.35