Finding the Fourth Proportional to 78,911.78, 118,419.45 and 28,992.29

Step by Step Solution

1. Step 1: Write the proportion equation
   78,911.78 : 118,419.45 = 28,992.29 : x
2. Step 2: Convert to fraction form
   78,911.78/118,419.45 = 28,992.29/x
3. Step 3: Cross multiply
   78,911.78x = 118,419.45 × 28,992.29
4. Step 4: Simplify right side
   78,911.78x = 3,433,250,498.30
5. Step 5: Solve for x
   x = 3,433,250,498.30/78,911.78
6. Step 6: Final answer
   x = 43,507.45