Finding the Fourth Proportional to 9,978.21, 14,972.37 and 6,648.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.21 : 14,972.37 = 6,648.74 : x
2. Step 2: Convert to fraction form
   9,978.21/14,972.37 = 6,648.74/x
3. Step 3: Cross multiply
   9,978.21x = 14,972.37 × 6,648.74
4. Step 4: Simplify right side
   9,978.21x = 99,547,320.45
5. Step 5: Solve for x
   x = 99,547,320.45/9,978.21
6. Step 6: Final answer
   x = 9,976.47