Finding the Fourth Proportional to 35,978.98, 53,964.60 and 9,686.38

Step by Step Solution

1. Step 1: Write the proportion equation
   35,978.98 : 53,964.60 = 9,686.38 : x
2. Step 2: Convert to fraction form
   35,978.98/53,964.60 = 9,686.38/x
3. Step 3: Cross multiply
   35,978.98x = 53,964.60 × 9,686.38
4. Step 4: Simplify right side
   35,978.98x = 522,721,622.15
5. Step 5: Solve for x
   x = 522,721,622.15/35,978.98
6. Step 6: Final answer
   x = 14,528.53