Finding the Fourth Proportional to 518,066.50, 777,143.76 and 144,089.50

Step by Step Solution

1. Step 1: Write the proportion equation
   518,066.50 : 777,143.76 = 144,089.50 : x
2. Step 2: Convert to fraction form
   518,066.50/777,143.76 = 144,089.50/x
3. Step 3: Cross multiply
   518,066.50x = 777,143.76 × 144,089.50
4. Step 4: Simplify right side
   518,066.50x = 111,978,255,806.52
5. Step 5: Solve for x
   x = 111,978,255,806.52/518,066.50
6. Step 6: Final answer
   x = 216,146.49