Finding the Fourth Proportional to 1,820.61, 2,731.05 and 522.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,820.61 : 2,731.05 = 522.18 : x
2. Step 2: Convert to fraction form
   1,820.61/2,731.05 = 522.18/x
3. Step 3: Cross multiply
   1,820.61x = 2,731.05 × 522.18
4. Step 4: Simplify right side
   1,820.61x = 1,426,099.69
5. Step 5: Solve for x
   x = 1,426,099.69/1,820.61
6. Step 6: Final answer
   x = 783.31