Finding the Fourth Proportional to 139,954.42, 209,964.71 and 55,719.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139,954.42 : 209,964.71 = 55,719.42 : x
2. Step 2: Convert to fraction form
   139,954.42/209,964.71 = 55,719.42/x
3. Step 3: Cross multiply
   139,954.42x = 209,964.71 × 55,719.42
4. Step 4: Simplify right side
   139,954.42x = 11,699,111,861.67
5. Step 5: Solve for x
   x = 11,699,111,861.67/139,954.42
6. Step 6: Final answer
   x = 83,592.30