Finding the Fourth Proportional to 12,621.88, 17,411.34 and 7,905.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,621.88 : 17,411.34 = 7,905.16 : x
2. Step 2: Convert to fraction form
   12,621.88/17,411.34 = 7,905.16/x
3. Step 3: Cross multiply
   12,621.88x = 17,411.34 × 7,905.16
4. Step 4: Simplify right side
   12,621.88x = 137,639,428.51
5. Step 5: Solve for x
   x = 137,639,428.51/12,621.88
6. Step 6: Final answer
   x = 10,904.83