Finding the Fourth Proportional to 9,978.12, 14,970.76 and 4,276.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.12 : 14,970.76 = 4,276.69 : x
2. Step 2: Convert to fraction form
   9,978.12/14,970.76 = 4,276.69/x
3. Step 3: Cross multiply
   9,978.12x = 14,970.76 × 4,276.69
4. Step 4: Simplify right side
   9,978.12x = 64,025,299.58
5. Step 5: Solve for x
   x = 64,025,299.58/9,978.12
6. Step 6: Final answer
   x = 6,416.57