Finding the Fourth Proportional to 78,978.52, 118,390.02 and 31,579.57

Step by Step Solution

1. Step 1: Write the proportion equation
   78,978.52 : 118,390.02 = 31,579.57 : x
2. Step 2: Convert to fraction form
   78,978.52/118,390.02 = 31,579.57/x
3. Step 3: Cross multiply
   78,978.52x = 118,390.02 × 31,579.57
4. Step 4: Simplify right side
   78,978.52x = 3,738,705,923.89
5. Step 5: Solve for x
   x = 3,738,705,923.89/78,978.52
6. Step 6: Final answer
   x = 47,338.26