Finding the Fourth Proportional to 256,345.35, 384,561.76 and 78,848.43

Step by Step Solution

1. Step 1: Write the proportion equation
   256,345.35 : 384,561.76 = 78,848.43 : x
2. Step 2: Convert to fraction form
   256,345.35/384,561.76 = 78,848.43/x
3. Step 3: Cross multiply
   256,345.35x = 384,561.76 × 78,848.43
4. Step 4: Simplify right side
   256,345.35x = 30,322,091,014.04
5. Step 5: Solve for x
   x = 30,322,091,014.04/256,345.35
6. Step 6: Final answer
   x = 118,286.10