Finding the Fourth Proportional to 1,137.15, 1,702.99 and 648.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,137.15 : 1,702.99 = 648.72 : x
2. Step 2: Convert to fraction form
   1,137.15/1,702.99 = 648.72/x
3. Step 3: Cross multiply
   1,137.15x = 1,702.99 × 648.72
4. Step 4: Simplify right side
   1,137.15x = 1,104,760.43
5. Step 5: Solve for x
   x = 1,104,760.43/1,137.15
6. Step 6: Final answer
   x = 971.52