Finding the Fourth Proportional to 1,881.38, 2,821.59 and 785.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,881.38 : 2,821.59 = 785.15 : x
2. Step 2: Convert to fraction form
   1,881.38/2,821.59 = 785.15/x
3. Step 3: Cross multiply
   1,881.38x = 2,821.59 × 785.15
4. Step 4: Simplify right side
   1,881.38x = 2,215,357.28
5. Step 5: Solve for x
   x = 2,215,357.28/1,881.38
6. Step 6: Final answer
   x = 1,177.52