Finding the Fourth Proportional to 142,303, 196,361.40 and 78,637

Step by Step Solution

1. Step 1: Write the proportion equation
   142,303 : 196,361.40 = 78,637 : x
2. Step 2: Convert to fraction form
   142,303/196,361.40 = 78,637/x
3. Step 3: Cross multiply
   142,303x = 196,361.40 × 78,637
4. Step 4: Simplify right side
   142,303x = 15,441,271,411.80
5. Step 5: Solve for x
   x = 15,441,271,411.80/142,303
6. Step 6: Final answer
   x = 108,509.81