Finding the Fourth Proportional to 13,510.86, 18,644.31 and 7,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,510.86 : 18,644.31 = 7,921.50 : x
2. Step 2: Convert to fraction form
   13,510.86/18,644.31 = 7,921.50/x
3. Step 3: Cross multiply
   13,510.86x = 18,644.31 × 7,921.50
4. Step 4: Simplify right side
   13,510.86x = 147,690,901.67
5. Step 5: Solve for x
   x = 147,690,901.67/13,510.86
6. Step 6: Final answer
   x = 10,931.27