Finding the Fourth Proportional to 1,445.31, 2,167.56 and 520.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.31 : 2,167.56 = 520.83 : x
2. Step 2: Convert to fraction form
   1,445.31/2,167.56 = 520.83/x
3. Step 3: Cross multiply
   1,445.31x = 2,167.56 × 520.83
4. Step 4: Simplify right side
   1,445.31x = 1,128,930.27
5. Step 5: Solve for x
   x = 1,128,930.27/1,445.31
6. Step 6: Final answer
   x = 781.10