Finding the Fourth Proportional to 139,867.86, 209,984.72 and 83,045.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,867.86 : 209,984.72 = 83,045.50 : x
2. Step 2: Convert to fraction form
   139,867.86/209,984.72 = 83,045.50/x
3. Step 3: Cross multiply
   139,867.86x = 209,984.72 × 83,045.50
4. Step 4: Simplify right side
   139,867.86x = 17,438,285,014.84
5. Step 5: Solve for x
   x = 17,438,285,014.84/139,867.86
6. Step 6: Final answer
   x = 124,676.86