Finding the Fourth Proportional to 13,123.98, 18,111.02 and 7,155.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.98 : 18,111.02 = 7,155.63 : x
2. Step 2: Convert to fraction form
   13,123.98/18,111.02 = 7,155.63/x
3. Step 3: Cross multiply
   13,123.98x = 18,111.02 × 7,155.63
4. Step 4: Simplify right side
   13,123.98x = 129,595,722.26
5. Step 5: Solve for x
   x = 129,595,722.26/13,123.98
6. Step 6: Final answer
   x = 9,874.73