Finding the Fourth Proportional to 12,178.31, 16,780.96 and 9,345.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,178.31 : 16,780.96 = 9,345.56 : x
2. Step 2: Convert to fraction form
   12,178.31/16,780.96 = 9,345.56/x
3. Step 3: Cross multiply
   12,178.31x = 16,780.96 × 9,345.56
4. Step 4: Simplify right side
   12,178.31x = 156,827,468.54
5. Step 5: Solve for x
   x = 156,827,468.54/12,178.31
6. Step 6: Final answer
   x = 12,877.61