Finding the Fourth Proportional to 13,068.79, 18,035.12 and 7,100.57

Step by Step Solution

1. Step 1: Write the proportion equation
   13,068.79 : 18,035.12 = 7,100.57 : x
2. Step 2: Convert to fraction form
   13,068.79/18,035.12 = 7,100.57/x
3. Step 3: Cross multiply
   13,068.79x = 18,035.12 × 7,100.57
4. Step 4: Simplify right side
   13,068.79x = 128,059,632.02
5. Step 5: Solve for x
   x = 128,059,632.02/13,068.79
6. Step 6: Final answer
   x = 9,798.89