Finding the Fourth Proportional to 2,460.31, 3,690.51 and 816.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,460.31 : 3,690.51 = 816.87 : x
2. Step 2: Convert to fraction form
   2,460.31/3,690.51 = 816.87/x
3. Step 3: Cross multiply
   2,460.31x = 3,690.51 × 816.87
4. Step 4: Simplify right side
   2,460.31x = 3,014,666.90
5. Step 5: Solve for x
   x = 3,014,666.90/2,460.31
6. Step 6: Final answer
   x = 1,225.32