Finding the Fourth Proportional to 6,654.38, 9,985.21 and 3,191.63

Step by Step Solution

1. Step 1: Write the proportion equation
   6,654.38 : 9,985.21 = 3,191.63 : x
2. Step 2: Convert to fraction form
   6,654.38/9,985.21 = 3,191.63/x
3. Step 3: Cross multiply
   6,654.38x = 9,985.21 × 3,191.63
4. Step 4: Simplify right side
   6,654.38x = 31,869,037.89
5. Step 5: Solve for x
   x = 31,869,037.89/6,654.38
6. Step 6: Final answer
   x = 4,789.19