Finding the Fourth Proportional to 1,440.90, 1,988.82 and 851.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.90 : 1,988.82 = 851.61 : x
2. Step 2: Convert to fraction form
   1,440.90/1,988.82 = 851.61/x
3. Step 3: Cross multiply
   1,440.90x = 1,988.82 × 851.61
4. Step 4: Simplify right side
   1,440.90x = 1,693,699.00
5. Step 5: Solve for x
   x = 1,693,699.00/1,440.90
6. Step 6: Final answer
   x = 1,175.45