Finding the Fourth Proportional to 42,591.06, 63,896.31 and 13,013.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,591.06 : 63,896.31 = 13,013.10 : x
2. Step 2: Convert to fraction form
   42,591.06/63,896.31 = 13,013.10/x
3. Step 3: Cross multiply
   42,591.06x = 63,896.31 × 13,013.10
4. Step 4: Simplify right side
   42,591.06x = 831,489,071.66
5. Step 5: Solve for x
   x = 831,489,071.66/42,591.06
6. Step 6: Final answer
   x = 19,522.62