Finding the Fourth Proportional to 123,216.64, 169,962.24 and 72,880

Step by Step Solution

1. Step 1: Write the proportion equation
   123,216.64 : 169,962.24 = 72,880 : x
2. Step 2: Convert to fraction form
   123,216.64/169,962.24 = 72,880/x
3. Step 3: Cross multiply
   123,216.64x = 169,962.24 × 72,880
4. Step 4: Simplify right side
   123,216.64x = 12,386,848,051.20
5. Step 5: Solve for x
   x = 12,386,848,051.20/123,216.64
6. Step 6: Final answer
   x = 100,529.02