Finding the Fourth Proportional to 12,921.89, 17,833.86 and 7,885.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,921.89 : 17,833.86 = 7,885.04 : x
2. Step 2: Convert to fraction form
   12,921.89/17,833.86 = 7,885.04/x
3. Step 3: Cross multiply
   12,921.89x = 17,833.86 × 7,885.04
4. Step 4: Simplify right side
   12,921.89x = 140,620,699.45
5. Step 5: Solve for x
   x = 140,620,699.45/12,921.89
6. Step 6: Final answer
   x = 10,882.36