Finding the Fourth Proportional to 399,735.72, 551,374.98 and 256,268.52

Step by Step Solution

1. Step 1: Write the proportion equation
   399,735.72 : 551,374.98 = 256,268.52 : x
2. Step 2: Convert to fraction form
   399,735.72/551,374.98 = 256,268.52/x
3. Step 3: Cross multiply
   399,735.72x = 551,374.98 × 256,268.52
4. Step 4: Simplify right side
   399,735.72x = 141,300,050,089.63
5. Step 5: Solve for x
   x = 141,300,050,089.63/399,735.72
6. Step 6: Final answer
   x = 353,483.67