Finding the Fourth Proportional to 12,465.21, 17,196.90 and 7,991.58

Step by Step Solution

1. Step 1: Write the proportion equation
   12,465.21 : 17,196.90 = 7,991.58 : x
2. Step 2: Convert to fraction form
   12,465.21/17,196.90 = 7,991.58/x
3. Step 3: Cross multiply
   12,465.21x = 17,196.90 × 7,991.58
4. Step 4: Simplify right side
   12,465.21x = 137,430,402.10
5. Step 5: Solve for x
   x = 137,430,402.10/12,465.21
6. Step 6: Final answer
   x = 11,025.12