Finding the Fourth Proportional to 78,190.72, 117,294.72 and 30,791.68

Step by Step Solution

1. Step 1: Write the proportion equation
   78,190.72 : 117,294.72 = 30,791.68 : x
2. Step 2: Convert to fraction form
   78,190.72/117,294.72 = 30,791.68/x
3. Step 3: Cross multiply
   78,190.72x = 117,294.72 × 30,791.68
4. Step 4: Simplify right side
   78,190.72x = 3,611,701,483.93
5. Step 5: Solve for x
   x = 3,611,701,483.93/78,190.72
6. Step 6: Final answer
   x = 46,190.92