Finding the Fourth Proportional to 12,461.52, 18,688.23 and 4,139.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,461.52 : 18,688.23 = 4,139.30 : x
2. Step 2: Convert to fraction form
   12,461.52/18,688.23 = 4,139.30/x
3. Step 3: Cross multiply
   12,461.52x = 18,688.23 × 4,139.30
4. Step 4: Simplify right side
   12,461.52x = 77,356,097.00
5. Step 5: Solve for x
   x = 77,356,097.00/12,461.52
6. Step 6: Final answer
   x = 6,207.60