Finding the Fourth Proportional to 142,603.87, 196,793.40 and 78,077.29

Step by Step Solution

1. Step 1: Write the proportion equation
   142,603.87 : 196,793.40 = 78,077.29 : x
2. Step 2: Convert to fraction form
   142,603.87/196,793.40 = 78,077.29/x
3. Step 3: Cross multiply
   142,603.87x = 196,793.40 × 78,077.29
4. Step 4: Simplify right side
   142,603.87x = 15,365,093,987.53
5. Step 5: Solve for x
   x = 15,365,093,987.53/142,603.87
6. Step 6: Final answer
   x = 107,746.69