Finding the Fourth Proportional to 9,091.51, 12,543.19 and 5,111.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,091.51 : 12,543.19 = 5,111.78 : x
2. Step 2: Convert to fraction form
   9,091.51/12,543.19 = 5,111.78/x
3. Step 3: Cross multiply
   9,091.51x = 12,543.19 × 5,111.78
4. Step 4: Simplify right side
   9,091.51x = 64,117,952.28
5. Step 5: Solve for x
   x = 64,117,952.28/9,091.51
6. Step 6: Final answer
   x = 7,052.51