Finding the Fourth Proportional to 139,470.83, 209,207.72 and 55,251.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,470.83 : 209,207.72 = 55,251.50 : x
2. Step 2: Convert to fraction form
   139,470.83/209,207.72 = 55,251.50/x
3. Step 3: Cross multiply
   139,470.83x = 209,207.72 × 55,251.50
4. Step 4: Simplify right side
   139,470.83x = 11,559,039,019.28
5. Step 5: Solve for x
   x = 11,559,039,019.28/139,470.83
6. Step 6: Final answer
   x = 82,877.83