Finding the Fourth Proportional to 13,139.73, 19,705.37 and 4,372.29

Step by Step Solution

1. Step 1: Write the proportion equation
   13,139.73 : 19,705.37 = 4,372.29 : x
2. Step 2: Convert to fraction form
   13,139.73/19,705.37 = 4,372.29/x
3. Step 3: Cross multiply
   13,139.73x = 19,705.37 × 4,372.29
4. Step 4: Simplify right side
   13,139.73x = 86,157,570.34
5. Step 5: Solve for x
   x = 86,157,570.34/13,139.73
6. Step 6: Final answer
   x = 6,557.03