Finding the Fourth Proportional to 13,091.61, 18,066.60 and 7,123.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.61 : 18,066.60 = 7,123.53 : x
2. Step 2: Convert to fraction form
   13,091.61/18,066.60 = 7,123.53/x
3. Step 3: Cross multiply
   13,091.61x = 18,066.60 × 7,123.53
4. Step 4: Simplify right side
   13,091.61x = 128,697,967.10
5. Step 5: Solve for x
   x = 128,697,967.10/13,091.61
6. Step 6: Final answer
   x = 9,830.57