Finding the Fourth Proportional to 12,912.31, 17,824.89 and 9,927.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.31 : 17,824.89 = 9,927.10 : x
2. Step 2: Convert to fraction form
   12,912.31/17,824.89 = 9,927.10/x
3. Step 3: Cross multiply
   12,912.31x = 17,824.89 × 9,927.10
4. Step 4: Simplify right side
   12,912.31x = 176,949,465.52
5. Step 5: Solve for x
   x = 176,949,465.52/12,912.31
6. Step 6: Final answer
   x = 13,703.94