Finding the Fourth Proportional to 1,404.71, 1,938.19 and 814.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,404.71 : 1,938.19 = 814.90 : x
2. Step 2: Convert to fraction form
   1,404.71/1,938.19 = 814.90/x
3. Step 3: Cross multiply
   1,404.71x = 1,938.19 × 814.90
4. Step 4: Simplify right side
   1,404.71x = 1,579,440.00
5. Step 5: Solve for x
   x = 1,579,440.00/1,404.71
6. Step 6: Final answer
   x = 1,124.39