Finding the Fourth Proportional to 123,256.64, 170,096.40 and 72,305.92

Step by Step Solution

1. Step 1: Write the proportion equation
   123,256.64 : 170,096.40 = 72,305.92 : x
2. Step 2: Convert to fraction form
   123,256.64/170,096.40 = 72,305.92/x
3. Step 3: Cross multiply
   123,256.64x = 170,096.40 × 72,305.92
4. Step 4: Simplify right side
   123,256.64x = 12,298,976,690.69
5. Step 5: Solve for x
   x = 12,298,976,690.69/123,256.64
6. Step 6: Final answer
   x = 99,783.48