Finding the Fourth Proportional to 2,782.79, 4,173.52 and 807.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,782.79 : 4,173.52 = 807.89 : x
2. Step 2: Convert to fraction form
   2,782.79/4,173.52 = 807.89/x
3. Step 3: Cross multiply
   2,782.79x = 4,173.52 × 807.89
4. Step 4: Simplify right side
   2,782.79x = 3,371,720.17
5. Step 5: Solve for x
   x = 3,371,720.17/2,782.79
6. Step 6: Final answer
   x = 1,211.64