Finding the Fourth Proportional to 9,320.78, 12,862.73 and 5,071.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.78 : 12,862.73 = 5,071.87 : x
2. Step 2: Convert to fraction form
   9,320.78/12,862.73 = 5,071.87/x
3. Step 3: Cross multiply
   9,320.78x = 12,862.73 × 5,071.87
4. Step 4: Simplify right side
   9,320.78x = 65,238,083.68
5. Step 5: Solve for x
   x = 65,238,083.68/9,320.78
6. Step 6: Final answer
   x = 6,999.21