Finding the Fourth Proportional to 12,992.64, 17,932.80 and 7,690.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,992.64 : 17,932.80 = 7,690.56 : x
2. Step 2: Convert to fraction form
   12,992.64/17,932.80 = 7,690.56/x
3. Step 3: Cross multiply
   12,992.64x = 17,932.80 × 7,690.56
4. Step 4: Simplify right side
   12,992.64x = 137,913,274.37
5. Step 5: Solve for x
   x = 137,913,274.37/12,992.64
6. Step 6: Final answer
   x = 10,614.72