Finding the Fourth Proportional to 1,533.61, 2,116.38 and 870.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.61 : 2,116.38 = 870.49 : x
2. Step 2: Convert to fraction form
   1,533.61/2,116.38 = 870.49/x
3. Step 3: Cross multiply
   1,533.61x = 2,116.38 × 870.49
4. Step 4: Simplify right side
   1,533.61x = 1,842,287.63
5. Step 5: Solve for x
   x = 1,842,287.63/1,533.61
6. Step 6: Final answer
   x = 1,201.28