Finding the Fourth Proportional to 28,432.52, 42,641.82 and 12,628.84

Step by Step Solution

1. Step 1: Write the proportion equation
   28,432.52 : 42,641.82 = 12,628.84 : x
2. Step 2: Convert to fraction form
   28,432.52/42,641.82 = 12,628.84/x
3. Step 3: Cross multiply
   28,432.52x = 42,641.82 × 12,628.84
4. Step 4: Simplify right side
   28,432.52x = 538,516,722.09
5. Step 5: Solve for x
   x = 538,516,722.09/28,432.52
6. Step 6: Final answer
   x = 18,940.17