Finding the Fourth Proportional to 2,120.86, 3,181.98 and 888.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.86 : 3,181.98 = 888.61 : x
2. Step 2: Convert to fraction form
   2,120.86/3,181.98 = 888.61/x
3. Step 3: Cross multiply
   2,120.86x = 3,181.98 × 888.61
4. Step 4: Simplify right side
   2,120.86x = 2,827,539.25
5. Step 5: Solve for x
   x = 2,827,539.25/2,120.86
6. Step 6: Final answer
   x = 1,333.20