Finding the Fourth Proportional to 1,146.07, 1,581.60 and 648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,146.07 : 1,581.60 = 648.72 : x
2. Step 2: Convert to fraction form
   1,146.07/1,581.60 = 648.72/x
3. Step 3: Cross multiply
   1,146.07x = 1,581.60 × 648.72
4. Step 4: Simplify right side
   1,146.07x = 1,026,015.55
5. Step 5: Solve for x
   x = 1,026,015.55/1,146.07
6. Step 6: Final answer
   x = 895.25