Finding the Fourth Proportional to 1,533.83, 2,116.68 and 870.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,533.83 : 2,116.68 = 870.55 : x
2. Step 2: Convert to fraction form
   1,533.83/2,116.68 = 870.55/x
3. Step 3: Cross multiply
   1,533.83x = 2,116.68 × 870.55
4. Step 4: Simplify right side
   1,533.83x = 1,842,667.22
5. Step 5: Solve for x
   x = 1,842,667.22/1,533.83
6. Step 6: Final answer
   x = 1,201.35