Finding the Fourth Proportional to 78,915.72, 118,357.62 and 28,978.68

Step by Step Solution

1. Step 1: Write the proportion equation
   78,915.72 : 118,357.62 = 28,978.68 : x
2. Step 2: Convert to fraction form
   78,915.72/118,357.62 = 28,978.68/x
3. Step 3: Cross multiply
   78,915.72x = 118,357.62 × 28,978.68
4. Step 4: Simplify right side
   78,915.72x = 3,429,847,595.54
5. Step 5: Solve for x
   x = 3,429,847,595.54/78,915.72
6. Step 6: Final answer
   x = 43,462.16