Finding the Fourth Proportional to 276,820.08, 415,288.56 and 89,817.12

Step by Step Solution

1. Step 1: Write the proportion equation
   276,820.08 : 415,288.56 = 89,817.12 : x
2. Step 2: Convert to fraction form
   276,820.08/415,288.56 = 89,817.12/x
3. Step 3: Cross multiply
   276,820.08x = 415,288.56 × 89,817.12
4. Step 4: Simplify right side
   276,820.08x = 37,300,022,428.15
5. Step 5: Solve for x
   x = 37,300,022,428.15/276,820.08
6. Step 6: Final answer
   x = 134,744.64