Finding the Fourth Proportional to 139,568.34, 209,421.76 and 55,326.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,568.34 : 209,421.76 = 55,326.72 : x
2. Step 2: Convert to fraction form
   139,568.34/209,421.76 = 55,326.72/x
3. Step 3: Cross multiply
   139,568.34x = 209,421.76 × 55,326.72
4. Step 4: Simplify right side
   139,568.34x = 11,586,619,077.43
5. Step 5: Solve for x
   x = 11,586,619,077.43/139,568.34
6. Step 6: Final answer
   x = 83,017.53