Finding the Fourth Proportional to 13,091.86, 18,066.72 and 7,123.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.86 : 18,066.72 = 7,123.42 : x
2. Step 2: Convert to fraction form
   13,091.86/18,066.72 = 7,123.42/x
3. Step 3: Cross multiply
   13,091.86x = 18,066.72 × 7,123.42
4. Step 4: Simplify right side
   13,091.86x = 128,696,834.58
5. Step 5: Solve for x
   x = 128,696,834.58/13,091.86
6. Step 6: Final answer
   x = 9,830.29