Finding the Fourth Proportional to 1,533.59, 2,116.42 and 870.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.59 : 2,116.42 = 870.51 : x
2. Step 2: Convert to fraction form
   1,533.59/2,116.42 = 870.51/x
3. Step 3: Cross multiply
   1,533.59x = 2,116.42 × 870.51
4. Step 4: Simplify right side
   1,533.59x = 1,842,357.93
5. Step 5: Solve for x
   x = 1,842,357.93/1,533.59
6. Step 6: Final answer
   x = 1,201.33