Finding the Fourth Proportional to 9,978.54, 14,970.60 and 4,356.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.54 : 14,970.60 = 4,356.72 : x
2. Step 2: Convert to fraction form
   9,978.54/14,970.60 = 4,356.72/x
3. Step 3: Cross multiply
   9,978.54x = 14,970.60 × 4,356.72
4. Step 4: Simplify right side
   9,978.54x = 65,222,712.43
5. Step 5: Solve for x
   x = 65,222,712.43/9,978.54
6. Step 6: Final answer
   x = 6,536.30