Finding the Fourth Proportional to 1,056.63, 1,586.78 and 648.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,056.63 : 1,586.78 = 648.17 : x
2. Step 2: Convert to fraction form
   1,056.63/1,586.78 = 648.17/x
3. Step 3: Cross multiply
   1,056.63x = 1,586.78 × 648.17
4. Step 4: Simplify right side
   1,056.63x = 1,028,503.19
5. Step 5: Solve for x
   x = 1,028,503.19/1,056.63
6. Step 6: Final answer
   x = 973.38