Finding the Fourth Proportional to 12,111.18, 18,159.45 and 7,897.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111.18 : 18,159.45 = 7,897.56 : x
2. Step 2: Convert to fraction form
   12,111.18/18,159.45 = 7,897.56/x
3. Step 3: Cross multiply
   12,111.18x = 18,159.45 × 7,897.56
4. Step 4: Simplify right side
   12,111.18x = 143,415,345.94
5. Step 5: Solve for x
   x = 143,415,345.94/12,111.18
6. Step 6: Final answer
   x = 11,841.57