Finding the Fourth Proportional to 1,478.30, 2,040.06 and 815.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.30 : 2,040.06 = 815.22 : x
2. Step 2: Convert to fraction form
   1,478.30/2,040.06 = 815.22/x
3. Step 3: Cross multiply
   1,478.30x = 2,040.06 × 815.22
4. Step 4: Simplify right side
   1,478.30x = 1,663,097.71
5. Step 5: Solve for x
   x = 1,663,097.71/1,478.30
6. Step 6: Final answer
   x = 1,125.01