Finding the Fourth Proportional to 828,498.48, 1,242,870.73 and 259,926.32

Step by Step Solution

1. Step 1: Write the proportion equation
   828,498.48 : 1,242,870.73 = 259,926.32 : x
2. Step 2: Convert to fraction form
   828,498.48/1,242,870.73 = 259,926.32/x
3. Step 3: Cross multiply
   828,498.48x = 1,242,870.73 × 259,926.32
4. Step 4: Simplify right side
   828,498.48x = 323,054,812,012.91
5. Step 5: Solve for x
   x = 323,054,812,012.91/828,498.48
6. Step 6: Final answer
   x = 389,928.07