Finding the Fourth Proportional to 1,093.55, 1,641.35 and 870.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.55 : 1,641.35 = 870.08 : x
2. Step 2: Convert to fraction form
   1,093.55/1,641.35 = 870.08/x
3. Step 3: Cross multiply
   1,093.55x = 1,641.35 × 870.08
4. Step 4: Simplify right side
   1,093.55x = 1,428,099.78
5. Step 5: Solve for x
   x = 1,428,099.78/1,093.55
6. Step 6: Final answer
   x = 1,305.94