Finding the Fourth Proportional to 9,964.20, 14,978.70 and 7,062.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,964.20 : 14,978.70 = 7,062.60 : x
2. Step 2: Convert to fraction form
   9,964.20/14,978.70 = 7,062.60/x
3. Step 3: Cross multiply
   9,964.20x = 14,978.70 × 7,062.60
4. Step 4: Simplify right side
   9,964.20x = 105,788,566.62
5. Step 5: Solve for x
   x = 105,788,566.62/9,964.20
6. Step 6: Final answer
   x = 10,616.87