Finding the Fourth Proportional to 1,611.40, 2,418.72 and 881.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,611.40 : 2,418.72 = 881.32 : x
2. Step 2: Convert to fraction form
   1,611.40/2,418.72 = 881.32/x
3. Step 3: Cross multiply
   1,611.40x = 2,418.72 × 881.32
4. Step 4: Simplify right side
   1,611.40x = 2,131,666.31
5. Step 5: Solve for x
   x = 2,131,666.31/1,611.40
6. Step 6: Final answer
   x = 1,322.87