Finding the Fourth Proportional to 1,357.91, 1,873.15 and 885.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.91 : 1,873.15 = 885.12 : x
2. Step 2: Convert to fraction form
   1,357.91/1,873.15 = 885.12/x
3. Step 3: Cross multiply
   1,357.91x = 1,873.15 × 885.12
4. Step 4: Simplify right side
   1,357.91x = 1,657,960.32
5. Step 5: Solve for x
   x = 1,657,960.32/1,357.91
6. Step 6: Final answer
   x = 1,220.97