Finding the Fourth Proportional to 21,071.77, 29,084.84 and 13,109.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,071.77 : 29,084.84 = 13,109.25 : x
2. Step 2: Convert to fraction form
   21,071.77/29,084.84 = 13,109.25/x
3. Step 3: Cross multiply
   21,071.77x = 29,084.84 × 13,109.25
4. Step 4: Simplify right side
   21,071.77x = 381,280,438.77
5. Step 5: Solve for x
   x = 381,280,438.77/21,071.77
6. Step 6: Final answer
   x = 18,094.37