Finding the Fourth Proportional to 14,203.76, 21,279.72 and 7,931.12

Step by Step Solution

1. Step 1: Write the proportion equation
   14,203.76 : 21,279.72 = 7,931.12 : x
2. Step 2: Convert to fraction form
   14,203.76/21,279.72 = 7,931.12/x
3. Step 3: Cross multiply
   14,203.76x = 21,279.72 × 7,931.12
4. Step 4: Simplify right side
   14,203.76x = 168,772,012.89
5. Step 5: Solve for x
   x = 168,772,012.89/14,203.76
6. Step 6: Final answer
   x = 11,882.21