Finding the Fourth Proportional to 1,085.58, 1,628.37 and 651.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,085.58 : 1,628.37 = 651.78 : x
2. Step 2: Convert to fraction form
   1,085.58/1,628.37 = 651.78/x
3. Step 3: Cross multiply
   1,085.58x = 1,628.37 × 651.78
4. Step 4: Simplify right side
   1,085.58x = 1,061,339.00
5. Step 5: Solve for x
   x = 1,061,339.00/1,085.58
6. Step 6: Final answer
   x = 977.67