Finding the Fourth Proportional to 1,549.79, 2,138.71 and 877.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,549.79 : 2,138.71 = 877.62 : x
2. Step 2: Convert to fraction form
   1,549.79/2,138.71 = 877.62/x
3. Step 3: Cross multiply
   1,549.79x = 2,138.71 × 877.62
4. Step 4: Simplify right side
   1,549.79x = 1,876,974.67
5. Step 5: Solve for x
   x = 1,876,974.67/1,549.79
6. Step 6: Final answer
   x = 1,211.12