Finding the Fourth Proportional to 19,090.71, 28,644.57 and 7,404.84

Step by Step Solution

1. Step 1: Write the proportion equation
   19,090.71 : 28,644.57 = 7,404.84 : x
2. Step 2: Convert to fraction form
   19,090.71/28,644.57 = 7,404.84/x
3. Step 3: Cross multiply
   19,090.71x = 28,644.57 × 7,404.84
4. Step 4: Simplify right side
   19,090.71x = 212,108,457.72
5. Step 5: Solve for x
   x = 212,108,457.72/19,090.71
6. Step 6: Final answer
   x = 11,110.56