Finding the Fourth Proportional to 11,997.60, 17,976.96 and 7,312.56

Step by Step Solution

1. Step 1: Write the proportion equation
   11,997.60 : 17,976.96 = 7,312.56 : x
2. Step 2: Convert to fraction form
   11,997.60/17,976.96 = 7,312.56/x
3. Step 3: Cross multiply
   11,997.60x = 17,976.96 × 7,312.56
4. Step 4: Simplify right side
   11,997.60x = 131,457,598.62
5. Step 5: Solve for x
   x = 131,457,598.62/11,997.60
6. Step 6: Final answer
   x = 10,956.99