Finding the Fourth Proportional to 280,096.32, 420,066.72 and 77,644.08

Step by Step Solution

1. Step 1: Write the proportion equation
   280,096.32 : 420,066.72 = 77,644.08 : x
2. Step 2: Convert to fraction form
   280,096.32/420,066.72 = 77,644.08/x
3. Step 3: Cross multiply
   280,096.32x = 420,066.72 × 77,644.08
4. Step 4: Simplify right side
   280,096.32x = 32,615,694,013.02
5. Step 5: Solve for x
   x = 32,615,694,013.02/280,096.32
6. Step 6: Final answer
   x = 116,444.56