Finding the Fourth Proportional to 257,978.62, 355,990.98 and 144,779.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,978.62 : 355,990.98 = 144,779.50 : x
2. Step 2: Convert to fraction form
   257,978.62/355,990.98 = 144,779.50/x
3. Step 3: Cross multiply
   257,978.62x = 355,990.98 × 144,779.50
4. Step 4: Simplify right side
   257,978.62x = 51,540,196,088.91
5. Step 5: Solve for x
   x = 51,540,196,088.91/257,978.62
6. Step 6: Final answer
   x = 199,784.76