Finding the Fourth Proportional to 1,881.31, 2,820.45 and 786.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,881.31 : 2,820.45 = 786.49 : x
2. Step 2: Convert to fraction form
   1,881.31/2,820.45 = 786.49/x
3. Step 3: Cross multiply
   1,881.31x = 2,820.45 × 786.49
4. Step 4: Simplify right side
   1,881.31x = 2,218,255.72
5. Step 5: Solve for x
   x = 2,218,255.72/1,881.31
6. Step 6: Final answer
   x = 1,179.10