Finding the Fourth Proportional to 1,641.87, 2,461.69 and 654.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.87 : 2,461.69 = 654.78 : x
2. Step 2: Convert to fraction form
   1,641.87/2,461.69 = 654.78/x
3. Step 3: Cross multiply
   1,641.87x = 2,461.69 × 654.78
4. Step 4: Simplify right side
   1,641.87x = 1,611,875.43
5. Step 5: Solve for x
   x = 1,611,875.43/1,641.87
6. Step 6: Final answer
   x = 981.73