Finding the Fourth Proportional to 1,225.46, 1,837.38 and 648.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,225.46 : 1,837.38 = 648.74 : x
2. Step 2: Convert to fraction form
   1,225.46/1,837.38 = 648.74/x
3. Step 3: Cross multiply
   1,225.46x = 1,837.38 × 648.74
4. Step 4: Simplify right side
   1,225.46x = 1,191,981.90
5. Step 5: Solve for x
   x = 1,191,981.90/1,225.46
6. Step 6: Final answer
   x = 972.68