Finding the Fourth Proportional to 287,300.61, 431,331.82 and 245,449.63

Step by Step Solution

1. Step 1: Write the proportion equation
   287,300.61 : 431,331.82 = 245,449.63 : x
2. Step 2: Convert to fraction form
   287,300.61/431,331.82 = 245,449.63/x
3. Step 3: Cross multiply
   287,300.61x = 431,331.82 × 245,449.63
4. Step 4: Simplify right side
   287,300.61x = 105,870,235,626.23
5. Step 5: Solve for x
   x = 105,870,235,626.23/287,300.61
6. Step 6: Final answer
   x = 368,499.86