Finding the Fourth Proportional to 138,185.33, 207,167.73 and 78,176.78

Step by Step Solution

1. Step 1: Write the proportion equation
   138,185.33 : 207,167.73 = 78,176.78 : x
2. Step 2: Convert to fraction form
   138,185.33/207,167.73 = 78,176.78/x
3. Step 3: Cross multiply
   138,185.33x = 207,167.73 × 78,176.78
4. Step 4: Simplify right side
   138,185.33x = 16,195,705,499.19
5. Step 5: Solve for x
   x = 16,195,705,499.19/138,185.33
6. Step 6: Final answer
   x = 117,202.79