Finding the Fourth Proportional to 1,116.89, 1,539.52 and 880.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.89 : 1,539.52 = 880.45 : x
2. Step 2: Convert to fraction form
   1,116.89/1,539.52 = 880.45/x
3. Step 3: Cross multiply
   1,116.89x = 1,539.52 × 880.45
4. Step 4: Simplify right side
   1,116.89x = 1,355,464.33
5. Step 5: Solve for x
   x = 1,355,464.33/1,116.89
6. Step 6: Final answer
   x = 1,213.61