Finding the Fourth Proportional to 1,815.50, 2,505.23 and 1,007.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.50 : 2,505.23 = 1,007.98 : x
2. Step 2: Convert to fraction form
   1,815.50/2,505.23 = 1,007.98/x
3. Step 3: Cross multiply
   1,815.50x = 2,505.23 × 1,007.98
4. Step 4: Simplify right side
   1,815.50x = 2,525,210.43
5. Step 5: Solve for x
   x = 2,525,210.43/1,815.50
6. Step 6: Final answer
   x = 1,390.92