Finding the Fourth Proportional to 12,156.50, 18,216.52 and 9,379.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.50 : 18,216.52 = 9,379.01 : x
2. Step 2: Convert to fraction form
   12,156.50/18,216.52 = 9,379.01/x
3. Step 3: Cross multiply
   12,156.50x = 18,216.52 × 9,379.01
4. Step 4: Simplify right side
   12,156.50x = 170,852,808.72
5. Step 5: Solve for x
   x = 170,852,808.72/12,156.50
6. Step 6: Final answer
   x = 14,054.45