Finding the Fourth Proportional to 1,818.34, 2,726.56 and 647.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,818.34 : 2,726.56 = 647.89 : x
2. Step 2: Convert to fraction form
   1,818.34/2,726.56 = 647.89/x
3. Step 3: Cross multiply
   1,818.34x = 2,726.56 × 647.89
4. Step 4: Simplify right side
   1,818.34x = 1,766,510.96
5. Step 5: Solve for x
   x = 1,766,510.96/1,818.34
6. Step 6: Final answer
   x = 971.50