Finding the Fourth Proportional to 78,271.71, 117,407.15 and 19,107.69

Step by Step Solution

1. Step 1: Write the proportion equation
   78,271.71 : 117,407.15 = 19,107.69 : x
2. Step 2: Convert to fraction form
   78,271.71/117,407.15 = 19,107.69/x
3. Step 3: Cross multiply
   78,271.71x = 117,407.15 × 19,107.69
4. Step 4: Simplify right side
   78,271.71x = 2,243,379,425.98
5. Step 5: Solve for x
   x = 2,243,379,425.98/78,271.71
6. Step 6: Final answer
   x = 28,661.43