Finding the Fourth Proportional to 256,724.91, 384,499.71 and 156,664.80

Step by Step Solution

1. Step 1: Write the proportion equation
   256,724.91 : 384,499.71 = 156,664.80 : x
2. Step 2: Convert to fraction form
   256,724.91/384,499.71 = 156,664.80/x
3. Step 3: Cross multiply
   256,724.91x = 384,499.71 × 156,664.80
4. Step 4: Simplify right side
   256,724.91x = 60,237,570,167.21
5. Step 5: Solve for x
   x = 60,237,570,167.21/256,724.91
6. Step 6: Final answer
   x = 234,638.59