Finding the Fourth Proportional to 1,478.90, 2,041.01 and 815.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,478.90 : 2,041.01 = 815.81 : x
2. Step 2: Convert to fraction form
   1,478.90/2,041.01 = 815.81/x
3. Step 3: Cross multiply
   1,478.90x = 2,041.01 × 815.81
4. Step 4: Simplify right side
   1,478.90x = 1,665,076.37
5. Step 5: Solve for x
   x = 1,665,076.37/1,478.90
6. Step 6: Final answer
   x = 1,125.89