Finding the Fourth Proportional to 9,907.31, 13,671.29 and 5,714.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,907.31 : 13,671.29 = 5,714.75 : x
2. Step 2: Convert to fraction form
   9,907.31/13,671.29 = 5,714.75/x
3. Step 3: Cross multiply
   9,907.31x = 13,671.29 × 5,714.75
4. Step 4: Simplify right side
   9,907.31x = 78,128,004.53
5. Step 5: Solve for x
   x = 78,128,004.53/9,907.31
6. Step 6: Final answer
   x = 7,885.89