Finding the Fourth Proportional to 9,111.51, 12,577.41 and 7,122.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.51 : 12,577.41 = 7,122.71 : x
2. Step 2: Convert to fraction form
   9,111.51/12,577.41 = 7,122.71/x
3. Step 3: Cross multiply
   9,111.51x = 12,577.41 × 7,122.71
4. Step 4: Simplify right side
   9,111.51x = 89,585,270.10
5. Step 5: Solve for x
   x = 89,585,270.10/9,111.51
6. Step 6: Final answer
   x = 9,832.10