Finding the Fourth Proportional to 8,920.72, 12,307.61 and 5,142.58

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.72 : 12,307.61 = 5,142.58 : x
2. Step 2: Convert to fraction form
   8,920.72/12,307.61 = 5,142.58/x
3. Step 3: Cross multiply
   8,920.72x = 12,307.61 × 5,142.58
4. Step 4: Simplify right side
   8,920.72x = 63,292,869.03
5. Step 5: Solve for x
   x = 63,292,869.03/8,920.72
6. Step 6: Final answer
   x = 7,095.04