Finding the Fourth Proportional to 8,406.72, 12,612.42 and 7,488.63

Step by Step Solution

1. Step 1: Write the proportion equation
   8,406.72 : 12,612.42 = 7,488.63 : x
2. Step 2: Convert to fraction form
   8,406.72/12,612.42 = 7,488.63/x
3. Step 3: Cross multiply
   8,406.72x = 12,612.42 × 7,488.63
4. Step 4: Simplify right side
   8,406.72x = 94,449,746.78
5. Step 5: Solve for x
   x = 94,449,746.78/8,406.72
6. Step 6: Final answer
   x = 11,235.03