Finding the Fourth Proportional to 142,648.16, 196,860.56 and 78,985.90

Step by Step Solution

1. Step 1: Write the proportion equation
   142,648.16 : 196,860.56 = 78,985.90 : x
2. Step 2: Convert to fraction form
   142,648.16/196,860.56 = 78,985.90/x
3. Step 3: Cross multiply
   142,648.16x = 196,860.56 × 78,985.90
4. Step 4: Simplify right side
   142,648.16x = 15,549,208,506.10
5. Step 5: Solve for x
   x = 15,549,208,506.10/142,648.16
6. Step 6: Final answer
   x = 109,003.92