Finding the Fourth Proportional to 493,100.10, 739,674.45 and 256,904.10

Step by Step Solution

1. Step 1: Write the proportion equation
   493,100.10 : 739,674.45 = 256,904.10 : x
2. Step 2: Convert to fraction form
   493,100.10/739,674.45 = 256,904.10/x
3. Step 3: Cross multiply
   493,100.10x = 739,674.45 × 256,904.10
4. Step 4: Simplify right side
   493,100.10x = 190,025,398,870.25
5. Step 5: Solve for x
   x = 190,025,398,870.25/493,100.10
6. Step 6: Final answer
   x = 385,368.81