Finding the Fourth Proportional to 1,318.15, 1,978.82 and 616.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,318.15 : 1,978.82 = 616.03 : x
2. Step 2: Convert to fraction form
   1,318.15/1,978.82 = 616.03/x
3. Step 3: Cross multiply
   1,318.15x = 1,978.82 × 616.03
4. Step 4: Simplify right side
   1,318.15x = 1,219,012.48
5. Step 5: Solve for x
   x = 1,219,012.48/1,318.15
6. Step 6: Final answer
   x = 924.79