Finding the Fourth Proportional to 78,780.24, 118,217.52 and 31,386.96

Step by Step Solution

1. Step 1: Write the proportion equation
   78,780.24 : 118,217.52 = 31,386.96 : x
2. Step 2: Convert to fraction form
   78,780.24/118,217.52 = 31,386.96/x
3. Step 3: Cross multiply
   78,780.24x = 118,217.52 × 31,386.96
4. Step 4: Simplify right side
   78,780.24x = 3,710,488,571.54
5. Step 5: Solve for x
   x = 3,710,488,571.54/78,780.24
6. Step 6: Final answer
   x = 47,099.23