Finding the Fourth Proportional to 142,068.60, 213,200.10 and 78,888.60

Step by Step Solution

1. Step 1: Write the proportion equation
   142,068.60 : 213,200.10 = 78,888.60 : x
2. Step 2: Convert to fraction form
   142,068.60/213,200.10 = 78,888.60/x
3. Step 3: Cross multiply
   142,068.60x = 213,200.10 × 78,888.60
4. Step 4: Simplify right side
   142,068.60x = 16,819,057,408.86
5. Step 5: Solve for x
   x = 16,819,057,408.86/142,068.60
6. Step 6: Final answer
   x = 118,386.87