Finding the Fourth Proportional to 1,357.72, 1,873.77 and 860.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.72 : 1,873.77 = 860.51 : x
2. Step 2: Convert to fraction form
   1,357.72/1,873.77 = 860.51/x
3. Step 3: Cross multiply
   1,357.72x = 1,873.77 × 860.51
4. Step 4: Simplify right side
   1,357.72x = 1,612,397.82
5. Step 5: Solve for x
   x = 1,612,397.82/1,357.72
6. Step 6: Final answer
   x = 1,187.58