Finding the Fourth Proportional to 21,457.89, 32,188.28 and 7,419.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,457.89 : 32,188.28 = 7,419.29 : x
2. Step 2: Convert to fraction form
   21,457.89/32,188.28 = 7,419.29/x
3. Step 3: Cross multiply
   21,457.89x = 32,188.28 × 7,419.29
4. Step 4: Simplify right side
   21,457.89x = 238,813,985.88
5. Step 5: Solve for x
   x = 238,813,985.88/21,457.89
6. Step 6: Final answer
   x = 11,129.43