Finding the Fourth Proportional to 9,109.77, 12,545.02 and 7,914.21

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.77 : 12,545.02 = 7,914.21 : x
2. Step 2: Convert to fraction form
   9,109.77/12,545.02 = 7,914.21/x
3. Step 3: Cross multiply
   9,109.77x = 12,545.02 × 7,914.21
4. Step 4: Simplify right side
   9,109.77x = 99,283,959.89
5. Step 5: Solve for x
   x = 99,283,959.89/9,109.77
6. Step 6: Final answer
   x = 10,898.62