Finding the Fourth Proportional to 12,345.72, 18,474.84 and 10,887.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.72 : 18,474.84 = 10,887.72 : x
2. Step 2: Convert to fraction form
   12,345.72/18,474.84 = 10,887.72/x
3. Step 3: Cross multiply
   12,345.72x = 18,474.84 × 10,887.72
4. Step 4: Simplify right side
   12,345.72x = 201,148,884.96
5. Step 5: Solve for x
   x = 201,148,884.96/12,345.72
6. Step 6: Final answer
   x = 16,293.01