Finding the Fourth Proportional to 12,490.17, 17,238.08 and 7,953.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,490.17 : 17,238.08 = 7,953.31 : x
2. Step 2: Convert to fraction form
   12,490.17/17,238.08 = 7,953.31/x
3. Step 3: Cross multiply
   12,490.17x = 17,238.08 × 7,953.31
4. Step 4: Simplify right side
   12,490.17x = 137,099,738.51
5. Step 5: Solve for x
   x = 137,099,738.51/12,490.17
6. Step 6: Final answer
   x = 10,976.61