Finding the Fourth Proportional to 1,404.76, 1,938.98 and 815.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.76 : 1,938.98 = 815.56 : x
2. Step 2: Convert to fraction form
   1,404.76/1,938.98 = 815.56/x
3. Step 3: Cross multiply
   1,404.76x = 1,938.98 × 815.56
4. Step 4: Simplify right side
   1,404.76x = 1,581,354.53
5. Step 5: Solve for x
   x = 1,581,354.53/1,404.76
6. Step 6: Final answer
   x = 1,125.71