Finding the Fourth Proportional to 13,091.78, 18,066.78 and 7,123.52

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.78 : 18,066.78 = 7,123.52 : x
2. Step 2: Convert to fraction form
   13,091.78/18,066.78 = 7,123.52/x
3. Step 3: Cross multiply
   13,091.78x = 18,066.78 × 7,123.52
4. Step 4: Simplify right side
   13,091.78x = 128,699,068.67
5. Step 5: Solve for x
   x = 128,699,068.67/13,091.78
6. Step 6: Final answer
   x = 9,830.52