Finding the Fourth Proportional to 123,865.98, 170,905.77 and 72,880.94

Step by Step Solution

1. Step 1: Write the proportion equation
   123,865.98 : 170,905.77 = 72,880.94 : x
2. Step 2: Convert to fraction form
   123,865.98/170,905.77 = 72,880.94/x
3. Step 3: Cross multiply
   123,865.98x = 170,905.77 × 72,880.94
4. Step 4: Simplify right side
   123,865.98x = 12,455,772,314.50
5. Step 5: Solve for x
   x = 12,455,772,314.50/123,865.98
6. Step 6: Final answer
   x = 100,558.46