Finding the Fourth Proportional to 9,989.86, 14,991.47 and 4,146.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,989.86 : 14,991.47 = 4,146.47 : x
2. Step 2: Convert to fraction form
   9,989.86/14,991.47 = 4,146.47/x
3. Step 3: Cross multiply
   9,989.86x = 14,991.47 × 4,146.47
4. Step 4: Simplify right side
   9,989.86x = 62,161,680.61
5. Step 5: Solve for x
   x = 62,161,680.61/9,989.86
6. Step 6: Final answer
   x = 6,222.48