Finding the Fourth Proportional to 11,665.60, 17,491.98 and 7,972

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.60 : 17,491.98 = 7,972 : x
2. Step 2: Convert to fraction form
   11,665.60/17,491.98 = 7,972/x
3. Step 3: Cross multiply
   11,665.60x = 17,491.98 × 7,972
4. Step 4: Simplify right side
   11,665.60x = 139,446,064.56
5. Step 5: Solve for x
   x = 139,446,064.56/11,665.60
6. Step 6: Final answer
   x = 11,953.61