Finding the Fourth Proportional to 5,677.55, 8,513.23 and 1,978.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,677.55 : 8,513.23 = 1,978.78 : x
2. Step 2: Convert to fraction form
   5,677.55/8,513.23 = 1,978.78/x
3. Step 3: Cross multiply
   5,677.55x = 8,513.23 × 1,978.78
4. Step 4: Simplify right side
   5,677.55x = 16,845,799.37
5. Step 5: Solve for x
   x = 16,845,799.37/5,677.55
6. Step 6: Final answer
   x = 2,967.09