Finding the Fourth Proportional to 1,037.80, 1,554.72 and 646.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,037.80 : 1,554.72 = 646.76 : x
2. Step 2: Convert to fraction form
   1,037.80/1,554.72 = 646.76/x
3. Step 3: Cross multiply
   1,037.80x = 1,554.72 × 646.76
4. Step 4: Simplify right side
   1,037.80x = 1,005,530.71
5. Step 5: Solve for x
   x = 1,005,530.71/1,037.80
6. Step 6: Final answer
   x = 968.91