Finding the Fourth Proportional to 1,404.98, 1,938.56 and 815.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.98 : 1,938.56 = 815.18 : x
2. Step 2: Convert to fraction form
   1,404.98/1,938.56 = 815.18/x
3. Step 3: Cross multiply
   1,404.98x = 1,938.56 × 815.18
4. Step 4: Simplify right side
   1,404.98x = 1,580,275.34
5. Step 5: Solve for x
   x = 1,580,275.34/1,404.98
6. Step 6: Final answer
   x = 1,124.77