Finding the Fourth Proportional to 1,445.27, 2,167.61 and 520.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,445.27 : 2,167.61 = 520.83 : x
2. Step 2: Convert to fraction form
   1,445.27/2,167.61 = 520.83/x
3. Step 3: Cross multiply
   1,445.27x = 2,167.61 × 520.83
4. Step 4: Simplify right side
   1,445.27x = 1,128,953.71
5. Step 5: Solve for x
   x = 1,128,953.71/1,445.27
6. Step 6: Final answer
   x = 781.14