Finding the Fourth Proportional to 1,486.58, 2,051.55 and 857.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,486.58 : 2,051.55 = 857.21 : x
2. Step 2: Convert to fraction form
   1,486.58/2,051.55 = 857.21/x
3. Step 3: Cross multiply
   1,486.58x = 2,051.55 × 857.21
4. Step 4: Simplify right side
   1,486.58x = 1,758,598.92
5. Step 5: Solve for x
   x = 1,758,598.92/1,486.58
6. Step 6: Final answer
   x = 1,182.99