Finding the Fourth Proportional to 9,111.40, 12,558.96 and 7,118.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.40 : 12,558.96 = 7,118.48 : x
2. Step 2: Convert to fraction form
   9,111.40/12,558.96 = 7,118.48/x
3. Step 3: Cross multiply
   9,111.40x = 12,558.96 × 7,118.48
4. Step 4: Simplify right side
   9,111.40x = 89,400,705.58
5. Step 5: Solve for x
   x = 89,400,705.58/9,111.40
6. Step 6: Final answer
   x = 9,811.96