Finding the Fourth Proportional to 493,801.61, 681,501.69 and 278,955.59

Step by Step Solution

1. Step 1: Write the proportion equation
   493,801.61 : 681,501.69 = 278,955.59 : x
2. Step 2: Convert to fraction form
   493,801.61/681,501.69 = 278,955.59/x
3. Step 3: Cross multiply
   493,801.61x = 681,501.69 × 278,955.59
4. Step 4: Simplify right side
   493,801.61x = 190,108,704,625.17
5. Step 5: Solve for x
   x = 190,108,704,625.17/493,801.61
6. Step 6: Final answer
   x = 384,990.05