Finding the Fourth Proportional to 9,905.32, 14,865.24 and 7,980.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,905.32 : 14,865.24 = 7,980.76 : x
2. Step 2: Convert to fraction form
   9,905.32/14,865.24 = 7,980.76/x
3. Step 3: Cross multiply
   9,905.32x = 14,865.24 × 7,980.76
4. Step 4: Simplify right side
   9,905.32x = 118,635,912.78
5. Step 5: Solve for x
   x = 118,635,912.78/9,905.32
6. Step 6: Final answer
   x = 11,976.99