Finding the Fourth Proportional to 7,086.98, 9,787.29 and 5,315.78

Step by Step Solution

1. Step 1: Write the proportion equation
   7,086.98 : 9,787.29 = 5,315.78 : x
2. Step 2: Convert to fraction form
   7,086.98/9,787.29 = 5,315.78/x
3. Step 3: Cross multiply
   7,086.98x = 9,787.29 × 5,315.78
4. Step 4: Simplify right side
   7,086.98x = 52,027,080.44
5. Step 5: Solve for x
   x = 52,027,080.44/7,086.98
6. Step 6: Final answer
   x = 7,341.22