Finding the Fourth Proportional to 42,586.56, 63,889.56 and 13,008.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,586.56 : 63,889.56 = 13,008.60 : x
2. Step 2: Convert to fraction form
   42,586.56/63,889.56 = 13,008.60/x
3. Step 3: Cross multiply
   42,586.56x = 63,889.56 × 13,008.60
4. Step 4: Simplify right side
   42,586.56x = 831,113,730.22
5. Step 5: Solve for x
   x = 831,113,730.22/42,586.56
6. Step 6: Final answer
   x = 19,515.87