Finding the Fourth Proportional to 9,111.80, 12,773.80 and 9,111.80

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.80 : 12,773.80 = 9,111.80 : x
2. Step 2: Convert to fraction form
   9,111.80/12,773.80 = 9,111.80/x
3. Step 3: Cross multiply
   9,111.80x = 12,773.80 × 9,111.80
4. Step 4: Simplify right side
   9,111.80x = 116,392,310.84
5. Step 5: Solve for x
   x = 116,392,310.84/9,111.80
6. Step 6: Final answer
   x = 12,773.80