Finding the Fourth Proportional to 8,665.86, 12,989.74 and 4,912.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,665.86 : 12,989.74 = 4,912.98 : x
2. Step 2: Convert to fraction form
   8,665.86/12,989.74 = 4,912.98/x
3. Step 3: Cross multiply
   8,665.86x = 12,989.74 × 4,912.98
4. Step 4: Simplify right side
   8,665.86x = 63,818,332.83
5. Step 5: Solve for x
   x = 63,818,332.83/8,665.86
6. Step 6: Final answer
   x = 7,364.34