Finding the Fourth Proportional to 8,915.42, 12,303.70 and 5,139.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,915.42 : 12,303.70 = 5,139.14 : x
2. Step 2: Convert to fraction form
   8,915.42/12,303.70 = 5,139.14/x
3. Step 3: Cross multiply
   8,915.42x = 12,303.70 × 5,139.14
4. Step 4: Simplify right side
   8,915.42x = 63,230,436.82
5. Step 5: Solve for x
   x = 63,230,436.82/8,915.42
6. Step 6: Final answer
   x = 7,092.26