Finding the Fourth Proportional to 13,309.31, 19,977.18 and 7,069.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,309.31 : 19,977.18 = 7,069.38 : x
2. Step 2: Convert to fraction form
   13,309.31/19,977.18 = 7,069.38/x
3. Step 3: Cross multiply
   13,309.31x = 19,977.18 × 7,069.38
4. Step 4: Simplify right side
   13,309.31x = 141,226,276.75
5. Step 5: Solve for x
   x = 141,226,276.75/13,309.31
6. Step 6: Final answer
   x = 10,611.09