Finding the Fourth Proportional to 21,069.32, 29,071.86 and 13,613

Step by Step Solution

1. Step 1: Write the proportion equation
   21,069.32 : 29,071.86 = 13,613 : x
2. Step 2: Convert to fraction form
   21,069.32/29,071.86 = 13,613/x
3. Step 3: Cross multiply
   21,069.32x = 29,071.86 × 13,613
4. Step 4: Simplify right side
   21,069.32x = 395,755,230.18
5. Step 5: Solve for x
   x = 395,755,230.18/21,069.32
6. Step 6: Final answer
   x = 18,783.48