Finding the Fourth Proportional to 13,123.95, 18,111.06 and 7,155.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.95 : 18,111.06 = 7,155.63 : x
2. Step 2: Convert to fraction form
   13,123.95/18,111.06 = 7,155.63/x
3. Step 3: Cross multiply
   13,123.95x = 18,111.06 × 7,155.63
4. Step 4: Simplify right side
   13,123.95x = 129,596,044.27
5. Step 5: Solve for x
   x = 129,596,044.27/13,123.95
6. Step 6: Final answer
   x = 9,874.77