Finding the Fourth Proportional to 257,300.07, 355,068.78 and 142,577.72

Step by Step Solution

1. Step 1: Write the proportion equation
   257,300.07 : 355,068.78 = 142,577.72 : x
2. Step 2: Convert to fraction form
   257,300.07/355,068.78 = 142,577.72/x
3. Step 3: Cross multiply
   257,300.07x = 355,068.78 × 142,577.72
4. Step 4: Simplify right side
   257,300.07x = 50,624,895,320.24
5. Step 5: Solve for x
   x = 50,624,895,320.24/257,300.07
6. Step 6: Final answer
   x = 196,754.30