Finding the Fourth Proportional to 2,173.98, 3,260.30 and 787.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.98 : 3,260.30 = 787.15 : x
2. Step 2: Convert to fraction form
   2,173.98/3,260.30 = 787.15/x
3. Step 3: Cross multiply
   2,173.98x = 3,260.30 × 787.15
4. Step 4: Simplify right side
   2,173.98x = 2,566,345.15
5. Step 5: Solve for x
   x = 2,566,345.15/2,173.98
6. Step 6: Final answer
   x = 1,180.48