Finding the Fourth Proportional to 1,488.90, 2,054.88 and 859.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.90 : 2,054.88 = 859.46 : x
2. Step 2: Convert to fraction form
   1,488.90/2,054.88 = 859.46/x
3. Step 3: Cross multiply
   1,488.90x = 2,054.88 × 859.46
4. Step 4: Simplify right side
   1,488.90x = 1,766,076.89
5. Step 5: Solve for x
   x = 1,766,076.89/1,488.90
6. Step 6: Final answer
   x = 1,186.16