Finding the Fourth Proportional to 9,317.90, 12,858.72 and 5,126.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,317.90 : 12,858.72 = 5,126.15 : x
2. Step 2: Convert to fraction form
   9,317.90/12,858.72 = 5,126.15/x
3. Step 3: Cross multiply
   9,317.90x = 12,858.72 × 5,126.15
4. Step 4: Simplify right side
   9,317.90x = 65,915,663.23
5. Step 5: Solve for x
   x = 65,915,663.23/9,317.90
6. Step 6: Final answer
   x = 7,074.09