Finding the Fourth Proportional to 1,585.55, 2,188.02 and 877.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,585.55 : 2,188.02 = 877.43 : x
2. Step 2: Convert to fraction form
   1,585.55/2,188.02 = 877.43/x
3. Step 3: Cross multiply
   1,585.55x = 2,188.02 × 877.43
4. Step 4: Simplify right side
   1,585.55x = 1,919,823.45
5. Step 5: Solve for x
   x = 1,919,823.45/1,585.55
6. Step 6: Final answer
   x = 1,210.83