Finding the Fourth Proportional to 1,478.46, 2,039.91 and 1,007.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.46 : 2,039.91 = 1,007.91 : x
2. Step 2: Convert to fraction form
   1,478.46/2,039.91 = 1,007.91/x
3. Step 3: Cross multiply
   1,478.46x = 2,039.91 × 1,007.91
4. Step 4: Simplify right side
   1,478.46x = 2,056,045.69
5. Step 5: Solve for x
   x = 2,056,045.69/1,478.46
6. Step 6: Final answer
   x = 1,390.67