Finding the Fourth Proportional to 9,072.30, 12,515.06 and 5,708.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,072.30 : 12,515.06 = 5,708.78 : x
2. Step 2: Convert to fraction form
   9,072.30/12,515.06 = 5,708.78/x
3. Step 3: Cross multiply
   9,072.30x = 12,515.06 × 5,708.78
4. Step 4: Simplify right side
   9,072.30x = 71,445,690.74
5. Step 5: Solve for x
   x = 71,445,690.74/9,072.30
6. Step 6: Final answer
   x = 7,875.14