Finding the Fourth Proportional to 1,404.99, 1,938.69 and 815.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.99 : 1,938.69 = 815.58 : x
2. Step 2: Convert to fraction form
   1,404.99/1,938.69 = 815.58/x
3. Step 3: Cross multiply
   1,404.99x = 1,938.69 × 815.58
4. Step 4: Simplify right side
   1,404.99x = 1,581,156.79
5. Step 5: Solve for x
   x = 1,581,156.79/1,404.99
6. Step 6: Final answer
   x = 1,125.39