Finding the Fourth Proportional to 1,478.17, 2,039.86 and 815.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.17 : 2,039.86 = 815.01 : x
2. Step 2: Convert to fraction form
   1,478.17/2,039.86 = 815.01/x
3. Step 3: Cross multiply
   1,478.17x = 2,039.86 × 815.01
4. Step 4: Simplify right side
   1,478.17x = 1,662,506.30
5. Step 5: Solve for x
   x = 1,662,506.30/1,478.17
6. Step 6: Final answer
   x = 1,124.71