Finding the Fourth Proportional to 1,051.47, 1,575.73 and 819.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.47 : 1,575.73 = 819.30 : x
2. Step 2: Convert to fraction form
   1,051.47/1,575.73 = 819.30/x
3. Step 3: Cross multiply
   1,051.47x = 1,575.73 × 819.30
4. Step 4: Simplify right side
   1,051.47x = 1,291,002.52
5. Step 5: Solve for x
   x = 1,291,002.52/1,051.47
6. Step 6: Final answer
   x = 1,227.81