Finding the Fourth Proportional to 6,425.91, 8,870.31 and 4,189.71

Step by Step Solution

1. Step 1: Write the proportion equation
   6,425.91 : 8,870.31 = 4,189.71 : x
2. Step 2: Convert to fraction form
   6,425.91/8,870.31 = 4,189.71/x
3. Step 3: Cross multiply
   6,425.91x = 8,870.31 × 4,189.71
4. Step 4: Simplify right side
   6,425.91x = 37,164,026.51
5. Step 5: Solve for x
   x = 37,164,026.51/6,425.91
6. Step 6: Final answer
   x = 5,783.47