Finding the Fourth Proportional to 2,658.56, 3,988.32 and 784.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,658.56 : 3,988.32 = 784.48 : x
2. Step 2: Convert to fraction form
   2,658.56/3,988.32 = 784.48/x
3. Step 3: Cross multiply
   2,658.56x = 3,988.32 × 784.48
4. Step 4: Simplify right side
   2,658.56x = 3,128,757.27
5. Step 5: Solve for x
   x = 3,128,757.27/2,658.56
6. Step 6: Final answer
   x = 1,176.86