Finding the Fourth Proportional to 1,818.31, 2,727.71 and 648.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,818.31 : 2,727.71 = 648.60 : x
2. Step 2: Convert to fraction form
   1,818.31/2,727.71 = 648.60/x
3. Step 3: Cross multiply
   1,818.31x = 2,727.71 × 648.60
4. Step 4: Simplify right side
   1,818.31x = 1,769,192.71
5. Step 5: Solve for x
   x = 1,769,192.71/1,818.31
6. Step 6: Final answer
   x = 972.99