Finding the Fourth Proportional to 9,100.70, 12,766.90 and 9,100.70

Step by Step Solution

1. Step 1: Write the proportion equation
   9,100.70 : 12,766.90 = 9,100.70 : x
2. Step 2: Convert to fraction form
   9,100.70/12,766.90 = 9,100.70/x
3. Step 3: Cross multiply
   9,100.70x = 12,766.90 × 9,100.70
4. Step 4: Simplify right side
   9,100.70x = 116,187,726.83
5. Step 5: Solve for x
   x = 116,187,726.83/9,100.70
6. Step 6: Final answer
   x = 12,766.90