Finding the Fourth Proportional to 12,300.31, 18,450.86 and 3,980.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,300.31 : 18,450.86 = 3,980.39 : x
2. Step 2: Convert to fraction form
   12,300.31/18,450.86 = 3,980.39/x
3. Step 3: Cross multiply
   12,300.31x = 18,450.86 × 3,980.39
4. Step 4: Simplify right side
   12,300.31x = 73,441,643.85
5. Step 5: Solve for x
   x = 73,441,643.85/12,300.31
6. Step 6: Final answer
   x = 5,970.72