Finding the Fourth Proportional to 6,429.88, 8,871.61 and 3,776.77

Step by Step Solution

1. Step 1: Write the proportion equation
   6,429.88 : 8,871.61 = 3,776.77 : x
2. Step 2: Convert to fraction form
   6,429.88/8,871.61 = 3,776.77/x
3. Step 3: Cross multiply
   6,429.88x = 8,871.61 × 3,776.77
4. Step 4: Simplify right side
   6,429.88x = 33,506,030.50
5. Step 5: Solve for x
   x = 33,506,030.50/6,429.88
6. Step 6: Final answer
   x = 5,210.99