Finding the Fourth Proportional to 9,109.31, 12,544.37 and 7,913.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.31 : 12,544.37 = 7,913.75 : x
2. Step 2: Convert to fraction form
   9,109.31/12,544.37 = 7,913.75/x
3. Step 3: Cross multiply
   9,109.31x = 12,544.37 × 7,913.75
4. Step 4: Simplify right side
   9,109.31x = 99,272,965.15
5. Step 5: Solve for x
   x = 99,272,965.15/9,109.31
6. Step 6: Final answer
   x = 10,897.97