Finding the Fourth Proportional to 278,766.38, 384,699.15 and 171,406.55

Step by Step Solution

1. Step 1: Write the proportion equation
   278,766.38 : 384,699.15 = 171,406.55 : x
2. Step 2: Convert to fraction form
   278,766.38/384,699.15 = 171,406.55/x
3. Step 3: Cross multiply
   278,766.38x = 384,699.15 × 171,406.55
4. Step 4: Simplify right side
   278,766.38x = 65,939,955,051.18
5. Step 5: Solve for x
   x = 65,939,955,051.18/278,766.38
6. Step 6: Final answer
   x = 236,541.99