Finding the Fourth Proportional to 42,591.56, 63,897.06 and 13,013.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,591.56 : 63,897.06 = 13,013.60 : x
2. Step 2: Convert to fraction form
   42,591.56/63,897.06 = 13,013.60/x
3. Step 3: Cross multiply
   42,591.56x = 63,897.06 × 13,013.60
4. Step 4: Simplify right side
   42,591.56x = 831,530,780.02
5. Step 5: Solve for x
   x = 831,530,780.02/42,591.56
6. Step 6: Final answer
   x = 19,523.37