Finding the Fourth Proportional to 253,818.29, 380,459.52 and 85,178.72

Step by Step Solution

1. Step 1: Write the proportion equation
   253,818.29 : 380,459.52 = 85,178.72 : x
2. Step 2: Convert to fraction form
   253,818.29/380,459.52 = 85,178.72/x
3. Step 3: Cross multiply
   253,818.29x = 380,459.52 × 85,178.72
4. Step 4: Simplify right side
   253,818.29x = 32,407,054,925.41
5. Step 5: Solve for x
   x = 32,407,054,925.41/253,818.29
6. Step 6: Final answer
   x = 127,678.17