Finding the Fourth Proportional to 12,490.85, 18,603.71 and 12,430.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,490.85 : 18,603.71 = 12,430.50 : x
2. Step 2: Convert to fraction form
   12,490.85/18,603.71 = 12,430.50/x
3. Step 3: Cross multiply
   12,490.85x = 18,603.71 × 12,430.50
4. Step 4: Simplify right side
   12,490.85x = 231,253,355.00
5. Step 5: Solve for x
   x = 231,253,355.00/12,490.85
6. Step 6: Final answer
   x = 18,513.83