Finding the Fourth Proportional to 1,404.84, 1,938.68 and 815.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.84 : 1,938.68 = 815.42 : x
2. Step 2: Convert to fraction form
   1,404.84/1,938.68 = 815.42/x
3. Step 3: Cross multiply
   1,404.84x = 1,938.68 × 815.42
4. Step 4: Simplify right side
   1,404.84x = 1,580,835.95
5. Step 5: Solve for x
   x = 1,580,835.95/1,404.84
6. Step 6: Final answer
   x = 1,125.28