Finding the Fourth Proportional to 28,385.37, 42,541.83 and 12,585.87

Step by Step Solution

1. Step 1: Write the proportion equation
   28,385.37 : 42,541.83 = 12,585.87 : x
2. Step 2: Convert to fraction form
   28,385.37/42,541.83 = 12,585.87/x
3. Step 3: Cross multiply
   28,385.37x = 42,541.83 × 12,585.87
4. Step 4: Simplify right side
   28,385.37x = 535,425,941.94
5. Step 5: Solve for x
   x = 535,425,941.94/28,385.37
6. Step 6: Final answer
   x = 18,862.74