Finding the Fourth Proportional to 278,641.42, 384,642.88 and 188,120.00

Step by Step Solution

1. Step 1: Write the proportion equation
   278,641.42 : 384,642.88 = 188,120.00 : x
2. Step 2: Convert to fraction form
   278,641.42/384,642.88 = 188,120.00/x
3. Step 3: Cross multiply
   278,641.42x = 384,642.88 × 188,120.00
4. Step 4: Simplify right side
   278,641.42x = 72,359,019,076.91
5. Step 5: Solve for x
   x = 72,359,019,076.91/278,641.42
6. Step 6: Final answer
   x = 259,685.08