Finding the Fourth Proportional to 1,533.78, 2,116.71 and 870.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.78 : 2,116.71 = 870.71 : x
2. Step 2: Convert to fraction form
   1,533.78/2,116.71 = 870.71/x
3. Step 3: Cross multiply
   1,533.78x = 2,116.71 × 870.71
4. Step 4: Simplify right side
   1,533.78x = 1,843,029.98
5. Step 5: Solve for x
   x = 1,843,029.98/1,533.78
6. Step 6: Final answer
   x = 1,201.63