Finding the Fourth Proportional to 28,384.38, 42,569.82 and 12,580.74

Step by Step Solution

1. Step 1: Write the proportion equation
   28,384.38 : 42,569.82 = 12,580.74 : x
2. Step 2: Convert to fraction form
   28,384.38/42,569.82 = 12,580.74/x
3. Step 3: Cross multiply
   28,384.38x = 42,569.82 × 12,580.74
4. Step 4: Simplify right side
   28,384.38x = 535,559,837.27
5. Step 5: Solve for x
   x = 535,559,837.27/28,384.38
6. Step 6: Final answer
   x = 18,868.12