Finding the Fourth Proportional to 1,505.53, 2,078.21 and 1,007.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,505.53 : 2,078.21 = 1,007.99 : x
2. Step 2: Convert to fraction form
   1,505.53/2,078.21 = 1,007.99/x
3. Step 3: Cross multiply
   1,505.53x = 2,078.21 × 1,007.99
4. Step 4: Simplify right side
   1,505.53x = 2,094,818.72
5. Step 5: Solve for x
   x = 2,094,818.72/1,505.53
6. Step 6: Final answer
   x = 1,391.41