Finding the Fourth Proportional to 23,390.64, 32,278.71 and 12,780.05

Step by Step Solution

1. Step 1: Write the proportion equation
   23,390.64 : 32,278.71 = 12,780.05 : x
2. Step 2: Convert to fraction form
   23,390.64/32,278.71 = 12,780.05/x
3. Step 3: Cross multiply
   23,390.64x = 32,278.71 × 12,780.05
4. Step 4: Simplify right side
   23,390.64x = 412,523,527.74
5. Step 5: Solve for x
   x = 412,523,527.74/23,390.64
6. Step 6: Final answer
   x = 17,636.27