Finding the Fourth Proportional to 1,440.05, 1,987.20 and 881.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.05 : 1,987.20 = 881.46 : x
2. Step 2: Convert to fraction form
   1,440.05/1,987.20 = 881.46/x
3. Step 3: Cross multiply
   1,440.05x = 1,987.20 × 881.46
4. Step 4: Simplify right side
   1,440.05x = 1,751,637.31
5. Step 5: Solve for x
   x = 1,751,637.31/1,440.05
6. Step 6: Final answer
   x = 1,216.38