Finding the Fourth Proportional to 13,124.82, 18,112.21 and 7,156.47

Step by Step Solution

1. Step 1: Write the proportion equation
   13,124.82 : 18,112.21 = 7,156.47 : x
2. Step 2: Convert to fraction form
   13,124.82/18,112.21 = 7,156.47/x
3. Step 3: Cross multiply
   13,124.82x = 18,112.21 × 7,156.47
4. Step 4: Simplify right side
   13,124.82x = 129,619,537.53
5. Step 5: Solve for x
   x = 129,619,537.53/13,124.82
6. Step 6: Final answer
   x = 9,875.91