Finding the Fourth Proportional to 1,781.78, 2,672.69 and 807.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,781.78 : 2,672.69 = 807.89 : x
2. Step 2: Convert to fraction form
   1,781.78/2,672.69 = 807.89/x
3. Step 3: Cross multiply
   1,781.78x = 2,672.69 × 807.89
4. Step 4: Simplify right side
   1,781.78x = 2,159,222.12
5. Step 5: Solve for x
   x = 2,159,222.12/1,781.78
6. Step 6: Final answer
   x = 1,211.84