Finding the Fourth Proportional to 1,404.93, 1,938.49 and 815.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.93 : 1,938.49 = 815.45 : x
2. Step 2: Convert to fraction form
   1,404.93/1,938.49 = 815.45/x
3. Step 3: Cross multiply
   1,404.93x = 1,938.49 × 815.45
4. Step 4: Simplify right side
   1,404.93x = 1,580,741.67
5. Step 5: Solve for x
   x = 1,580,741.67/1,404.93
6. Step 6: Final answer
   x = 1,125.14