Finding the Fourth Proportional to 543,978.79, 815,967.27 and 144,619.63

Step by Step Solution

1. Step 1: Write the proportion equation
   543,978.79 : 815,967.27 = 144,619.63 : x
2. Step 2: Convert to fraction form
   543,978.79/815,967.27 = 144,619.63/x
3. Step 3: Cross multiply
   543,978.79x = 815,967.27 × 144,619.63
4. Step 4: Simplify right side
   543,978.79x = 118,004,882,639.59
5. Step 5: Solve for x
   x = 118,004,882,639.59/543,978.79
6. Step 6: Final answer
   x = 216,929.20