Finding the Fourth Proportional to 21,457.94, 29,611.85 and 13,510.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,457.94 : 29,611.85 = 13,510.62 : x
2. Step 2: Convert to fraction form
   21,457.94/29,611.85 = 13,510.62/x
3. Step 3: Cross multiply
   21,457.94x = 29,611.85 × 13,510.62
4. Step 4: Simplify right side
   21,457.94x = 400,074,385.29
5. Step 5: Solve for x
   x = 400,074,385.29/21,457.94
6. Step 6: Final answer
   x = 18,644.59