Finding the Fourth Proportional to 123,051.28, 169,765.20 and 72,055.30

Step by Step Solution

1. Step 1: Write the proportion equation
   123,051.28 : 169,765.20 = 72,055.30 : x
2. Step 2: Convert to fraction form
   123,051.28/169,765.20 = 72,055.30/x
3. Step 3: Cross multiply
   123,051.28x = 169,765.20 × 72,055.30
4. Step 4: Simplify right side
   123,051.28x = 12,232,482,415.56
5. Step 5: Solve for x
   x = 12,232,482,415.56/123,051.28
6. Step 6: Final answer
   x = 99,409.63