Finding the Fourth Proportional to 1,807.31, 2,493.81 and 1,098.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,807.31 : 2,493.81 = 1,098.78 : x
2. Step 2: Convert to fraction form
   1,807.31/2,493.81 = 1,098.78/x
3. Step 3: Cross multiply
   1,807.31x = 2,493.81 × 1,098.78
4. Step 4: Simplify right side
   1,807.31x = 2,740,148.55
5. Step 5: Solve for x
   x = 2,740,148.55/1,807.31
6. Step 6: Final answer
   x = 1,516.15