Finding the Fourth Proportional to 9,876.72, 14,798.24 and 8,630.40

Step by Step Solution

1. Step 1: Write the proportion equation
   9,876.72 : 14,798.24 = 8,630.40 : x
2. Step 2: Convert to fraction form
   9,876.72/14,798.24 = 8,630.40/x
3. Step 3: Cross multiply
   9,876.72x = 14,798.24 × 8,630.40
4. Step 4: Simplify right side
   9,876.72x = 127,714,730.50
5. Step 5: Solve for x
   x = 127,714,730.50/9,876.72
6. Step 6: Final answer
   x = 12,930.88