Finding the Fourth Proportional to 9,312.51, 12,850.88 and 5,120.49

Step by Step Solution

1. Step 1: Write the proportion equation
   9,312.51 : 12,850.88 = 5,120.49 : x
2. Step 2: Convert to fraction form
   9,312.51/12,850.88 = 5,120.49/x
3. Step 3: Cross multiply
   9,312.51x = 12,850.88 × 5,120.49
4. Step 4: Simplify right side
   9,312.51x = 65,802,776.93
5. Step 5: Solve for x
   x = 65,802,776.93/9,312.51
6. Step 6: Final answer
   x = 7,066.06