Finding the Fourth Proportional to 78,987.18, 108,951.39 and 47,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,987.18 : 108,951.39 = 47,131.50 : x
2. Step 2: Convert to fraction form
   78,987.18/108,951.39 = 47,131.50/x
3. Step 3: Cross multiply
   78,987.18x = 108,951.39 × 47,131.50
4. Step 4: Simplify right side
   78,987.18x = 5,135,042,437.79
5. Step 5: Solve for x
   x = 5,135,042,437.79/78,987.18
6. Step 6: Final answer
   x = 65,011.09