Finding the Fourth Proportional to 920,870.82, 1,381,519.89 and 289,768.23

Step by Step Solution

1. Step 1: Write the proportion equation
   920,870.82 : 1,381,519.89 = 289,768.23 : x
2. Step 2: Convert to fraction form
   920,870.82/1,381,519.89 = 289,768.23/x
3. Step 3: Cross multiply
   920,870.82x = 1,381,519.89 × 289,768.23
4. Step 4: Simplify right side
   920,870.82x = 400,320,573,235.10
5. Step 5: Solve for x
   x = 400,320,573,235.10/920,870.82
6. Step 6: Final answer
   x = 434,719.58