Finding the Fourth Proportional to 103,722.41, 155,300.31 and 78,347.54

Step by Step Solution

1. Step 1: Write the proportion equation
   103,722.41 : 155,300.31 = 78,347.54 : x
2. Step 2: Convert to fraction form
   103,722.41/155,300.31 = 78,347.54/x
3. Step 3: Cross multiply
   103,722.41x = 155,300.31 × 78,347.54
4. Step 4: Simplify right side
   103,722.41x = 12,167,397,249.74
5. Step 5: Solve for x
   x = 12,167,397,249.74/103,722.41
6. Step 6: Final answer
   x = 117,307.31