Finding the Fourth Proportional to 13,091.60, 18,066.50 and 7,123.18

Step by Step Solution

1. Step 1: Write the proportion equation
   13,091.60 : 18,066.50 = 7,123.18 : x
2. Step 2: Convert to fraction form
   13,091.60/18,066.50 = 7,123.18/x
3. Step 3: Cross multiply
   13,091.60x = 18,066.50 × 7,123.18
4. Step 4: Simplify right side
   13,091.60x = 128,690,931.47
5. Step 5: Solve for x
   x = 128,690,931.47/13,091.60
6. Step 6: Final answer
   x = 9,830.04