Finding the Fourth Proportional to 142,421.99, 196,482.98 and 81,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   142,421.99 : 196,482.98 = 81,978.17 : x
2. Step 2: Convert to fraction form
   142,421.99/196,482.98 = 81,978.17/x
3. Step 3: Cross multiply
   142,421.99x = 196,482.98 × 81,978.17
4. Step 4: Simplify right side
   142,421.99x = 16,107,314,359.08
5. Step 5: Solve for x
   x = 16,107,314,359.08/142,421.99
6. Step 6: Final answer
   x = 113,095.70