Finding the Fourth Proportional to 19,399.86, 29,112.55 and 10,640.93

Step by Step Solution

1. Step 1: Write the proportion equation
   19,399.86 : 29,112.55 = 10,640.93 : x
2. Step 2: Convert to fraction form
   19,399.86/29,112.55 = 10,640.93/x
3. Step 3: Cross multiply
   19,399.86x = 29,112.55 × 10,640.93
4. Step 4: Simplify right side
   19,399.86x = 309,784,606.67
5. Step 5: Solve for x
   x = 309,784,606.67/19,399.86
6. Step 6: Final answer
   x = 15,968.39