Finding the Fourth Proportional to 12,665.55, 18,998.72 and 4,345.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,665.55 : 18,998.72 = 4,345.45 : x
2. Step 2: Convert to fraction form
   12,665.55/18,998.72 = 4,345.45/x
3. Step 3: Cross multiply
   12,665.55x = 18,998.72 × 4,345.45
4. Step 4: Simplify right side
   12,665.55x = 82,558,055.50
5. Step 5: Solve for x
   x = 82,558,055.50/12,665.55
6. Step 6: Final answer
   x = 6,518.31