Finding the Fourth Proportional to 865,872.50, 1,298,946.98 and 266,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   865,872.50 : 1,298,946.98 = 266,688.50 : x
2. Step 2: Convert to fraction form
   865,872.50/1,298,946.98 = 266,688.50/x
3. Step 3: Cross multiply
   865,872.50x = 1,298,946.98 × 266,688.50
4. Step 4: Simplify right side
   865,872.50x = 346,414,215,847.72
5. Step 5: Solve for x
   x = 346,414,215,847.72/865,872.50
6. Step 6: Final answer
   x = 400,075.32