Finding the Fourth Proportional to 19,615.40, 29,413.83 and 7,126.72

Step by Step Solution

1. Step 1: Write the proportion equation
   19,615.40 : 29,413.83 = 7,126.72 : x
2. Step 2: Convert to fraction form
   19,615.40/29,413.83 = 7,126.72/x
3. Step 3: Cross multiply
   19,615.40x = 29,413.83 × 7,126.72
4. Step 4: Simplify right side
   19,615.40x = 209,623,983.47
5. Step 5: Solve for x
   x = 209,623,983.47/19,615.40
6. Step 6: Final answer
   x = 10,686.70