Finding the Fourth Proportional to 12,070.38, 18,112.86 and 7,689.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,070.38 : 18,112.86 = 7,689.36 : x
2. Step 2: Convert to fraction form
   12,070.38/18,112.86 = 7,689.36/x
3. Step 3: Cross multiply
   12,070.38x = 18,112.86 × 7,689.36
4. Step 4: Simplify right side
   12,070.38x = 139,276,301.17
5. Step 5: Solve for x
   x = 139,276,301.17/12,070.38
6. Step 6: Final answer
   x = 11,538.68