Finding the Fourth Proportional to 455,667.46, 628,471.61 and 274,190.20

Step by Step Solution

1. Step 1: Write the proportion equation
   455,667.46 : 628,471.61 = 274,190.20 : x
2. Step 2: Convert to fraction form
   455,667.46/628,471.61 = 274,190.20/x
3. Step 3: Cross multiply
   455,667.46x = 628,471.61 × 274,190.20
4. Step 4: Simplify right side
   455,667.46x = 172,320,754,526.31
5. Step 5: Solve for x
   x = 172,320,754,526.31/455,667.46
6. Step 6: Final answer
   x = 378,172.18