Finding the Fourth Proportional to 1,404.80, 1,938.63 and 815.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.80 : 1,938.63 = 815.68 : x
2. Step 2: Convert to fraction form
   1,404.80/1,938.63 = 815.68/x
3. Step 3: Cross multiply
   1,404.80x = 1,938.63 × 815.68
4. Step 4: Simplify right side
   1,404.80x = 1,581,301.72
5. Step 5: Solve for x
   x = 1,581,301.72/1,404.80
6. Step 6: Final answer
   x = 1,125.64