Finding the Fourth Proportional to 6,429.88, 8,874.72 and 4,187.86

Step by Step Solution

1. Step 1: Write the proportion equation
   6,429.88 : 8,874.72 = 4,187.86 : x
2. Step 2: Convert to fraction form
   6,429.88/8,874.72 = 4,187.86/x
3. Step 3: Cross multiply
   6,429.88x = 8,874.72 × 4,187.86
4. Step 4: Simplify right side
   6,429.88x = 37,166,084.90
5. Step 5: Solve for x
   x = 37,166,084.90/6,429.88
6. Step 6: Final answer
   x = 5,780.21