Finding the Fourth Proportional to 42,589.56, 63,894.06 and 13,011.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,589.56 : 63,894.06 = 13,011.60 : x
2. Step 2: Convert to fraction form
   42,589.56/63,894.06 = 13,011.60/x
3. Step 3: Cross multiply
   42,589.56x = 63,894.06 × 13,011.60
4. Step 4: Simplify right side
   42,589.56x = 831,363,951.10
5. Step 5: Solve for x
   x = 831,363,951.10/42,589.56
6. Step 6: Final answer
   x = 19,520.37