Finding the Fourth Proportional to 9,112.51, 12,578.79 and 7,123.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,112.51 : 12,578.79 = 7,123.71 : x
2. Step 2: Convert to fraction form
   9,112.51/12,578.79 = 7,123.71/x
3. Step 3: Cross multiply
   9,112.51x = 12,578.79 × 7,123.71
4. Step 4: Simplify right side
   9,112.51x = 89,607,652.11
5. Step 5: Solve for x
   x = 89,607,652.11/9,112.51
6. Step 6: Final answer
   x = 9,833.48