Finding the Fourth Proportional to 1,819.59, 2,728.91 and 520.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,819.59 : 2,728.91 = 520.76 : x
2. Step 2: Convert to fraction form
   1,819.59/2,728.91 = 520.76/x
3. Step 3: Cross multiply
   1,819.59x = 2,728.91 × 520.76
4. Step 4: Simplify right side
   1,819.59x = 1,421,094.83
5. Step 5: Solve for x
   x = 1,421,094.83/1,819.59
6. Step 6: Final answer
   x = 781.00