Finding the Fourth Proportional to 13,123.30, 18,411.50 and 13,123.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.30 : 18,411.50 = 13,123.30 : x
2. Step 2: Convert to fraction form
   13,123.30/18,411.50 = 13,123.30/x
3. Step 3: Cross multiply
   13,123.30x = 18,411.50 × 13,123.30
4. Step 4: Simplify right side
   13,123.30x = 241,619,637.95
5. Step 5: Solve for x
   x = 241,619,637.95/13,123.30
6. Step 6: Final answer
   x = 18,411.50