Finding the Fourth Proportional to 11,812.29, 16,298.58 and 8,978.91

Step by Step Solution

1. Step 1: Write the proportion equation
   11,812.29 : 16,298.58 = 8,978.91 : x
2. Step 2: Convert to fraction form
   11,812.29/16,298.58 = 8,978.91/x
3. Step 3: Cross multiply
   11,812.29x = 16,298.58 × 8,978.91
4. Step 4: Simplify right side
   11,812.29x = 146,343,482.95
5. Step 5: Solve for x
   x = 146,343,482.95/11,812.29
6. Step 6: Final answer
   x = 12,389.09