Finding the Fourth Proportional to 9,017.64, 12,445.56 and 8,780.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,017.64 : 12,445.56 = 8,780.76 : x
2. Step 2: Convert to fraction form
   9,017.64/12,445.56 = 8,780.76/x
3. Step 3: Cross multiply
   9,017.64x = 12,445.56 × 8,780.76
4. Step 4: Simplify right side
   9,017.64x = 109,281,475.43
5. Step 5: Solve for x
   x = 109,281,475.43/9,017.64
6. Step 6: Final answer
   x = 12,118.63